When it rains, it puddles. Spilled salt cycles between wet and dry with humidity. Is this akin to a phase change?Which “exotic salt” can lower water's freezing point by 70 °C?Using table salt as a way to limit humidity in an unoccupied houseScientific Reason for Salt Solution Gaining VolumeHow much does water expand when heated, and does salt affect that?What phase of matter is salt when dissolved in water?The Salt Room, is there salt in the air?What is the difference between wet paint, dry paint, and in between those stages?What could cause one brand of carbonated water to be superiorly carbonated compared to another?Salt + Sodium Bicarbonate releasing water in carpetUsing table salt as a way to limit humidity in an unoccupied houseWill a film of oil on water retard evaporation (of water) and prevent air and atmospheric impurities from diffusing into it?What component(s) of instant coffee make it deliquescent?Why does humidifier put measurable PM2.5 in the air?
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When it rains, it puddles. Spilled salt cycles between wet and dry with humidity. Is this akin to a phase change?
Which “exotic salt” can lower water's freezing point by 70 °C?Using table salt as a way to limit humidity in an unoccupied houseScientific Reason for Salt Solution Gaining VolumeHow much does water expand when heated, and does salt affect that?What phase of matter is salt when dissolved in water?The Salt Room, is there salt in the air?What is the difference between wet paint, dry paint, and in between those stages?What could cause one brand of carbonated water to be superiorly carbonated compared to another?Salt + Sodium Bicarbonate releasing water in carpetUsing table salt as a way to limit humidity in an unoccupied houseWill a film of oil on water retard evaporation (of water) and prevent air and atmospheric impurities from diffusing into it?What component(s) of instant coffee make it deliquescent?Why does humidifier put measurable PM2.5 in the air?
$begingroup$
I have some spilled un-iodized table salt (NaCl). It is very humid where I live, and when it gets very humid for a few days, the salt absorbs so much water that it becomes a puddle of (probably) saturated salt water. When the humidity drops for a few days, the water evaporates and I have dry salt crystals again. This is repeatable.
My questions about this process are:
- What is this process called exactly? As far as I understand "deliquescence" is a property and not a process. Does the exchange of water between my pile of salt and the air have a specific terminology? Something that would go along with terms like evaporation, sublimation, condensation, etc.? Perhaps some mash-up of adsorption and dissolution?
- Is this process akin to a phase change in some way? For example, if I had a sealed box of air with a dish of salt and a beaker of water, and I could ramp the temperature slowly enough, would I see a plateau at a certain humidity as the salt hit a threshold and started absorbing water until saturated?
Some may be familliar with the Morton Salt logo and slogan "When it rains, it pours" meaning that other moisture-absorbing materials in the package will keep the sodium chloride as table salt from absorbing too much water and becoming stuck and un-pourable:
Source
everyday-chemistry water phase deliquescence
asked May 4 at 9:13
uhohuhoh
2,3261648
$endgroup$
|
show 1 more comment
$begingroup$
I have some spilled un-iodized table salt (NaCl). It is very humid where I live, and when it gets very humid for a few days, the salt absorbs so much water that it becomes a puddle of (probably) saturated salt water. When the humidity drops for a few days, the water evaporates and I have dry salt crystals again. This is repeatable.
My questions about this process are:
- What is this process called exactly? As far as I understand "deliquescence" is a property and not a process. Does the exchange of water between my pile of salt and the air have a specific terminology? Something that would go along with terms like evaporation, sublimation, condensation, etc.? Perhaps some mash-up of adsorption and dissolution?
- Is this process akin to a phase change in some way? For example, if I had a sealed box of air with a dish of salt and a beaker of water, and I could ramp the temperature slowly enough, would I see a plateau at a certain humidity as the salt hit a threshold and started absorbing water until saturated?
Some may be familliar with the Morton Salt logo and slogan "When it rains, it pours" meaning that other moisture-absorbing materials in the package will keep the sodium chloride as table salt from absorbing too much water and becoming stuck and un-pourable:
Source
everyday-chemistry water phase deliquescence
asked May 4 at 9:13
uhohuhoh
2,3261648
$endgroup$
$begingroup$
Well, hygroscopic comes to mind, and condensation. It is a phase transition. Initially, it may be considered a condensation reaction (a process on the surface of salt crystals, possibly with water migrating into the crystal). At some point, it is transtion from water in the gas phase to water in a saturated NaCl solution. In other words, this involves multiple stages as you move from hydrated crystals to solvated salt ions.
$endgroup$
– Night Writer
May 4 at 9:28
$begingroup$
@NightWriter "hygroscopicity" is a property, not a process, and condensation takes place without any hygroscopic materials being present. Also I don't think NaCl has a hydrated form. update: wait, maybe it does! en.wikipedia.org/wiki/Water_of_crystallization
$endgroup$
– uhoh
May 4 at 9:33
1
$begingroup$
See also chemistry.stackexchange.com/a/112915/35806
$endgroup$
– Poutnik
May 4 at 9:56
1
$begingroup$
NaCl does not have a hydrated form. It simply adsorbs water at its surface, which starts dissolving. When this surface phase becomes thick enough, it coalesces into one continous, NaCl saturated liquid phase, with residual salt particles still in it.
$endgroup$
– Karl
May 4 at 10:16
1
$begingroup$
also See also chemistry.stackexchange.com/a/63901/16035
$endgroup$
– uhoh
May 4 at 11:12
|
show 1 more comment
$begingroup$
I have some spilled un-iodized table salt (NaCl). It is very humid where I live, and when it gets very humid for a few days, the salt absorbs so much water that it becomes a puddle of (probably) saturated salt water. When the humidity drops for a few days, the water evaporates and I have dry salt crystals again. This is repeatable.
My questions about this process are:
- What is this process called exactly? As far as I understand "deliquescence" is a property and not a process. Does the exchange of water between my pile of salt and the air have a specific terminology? Something that would go along with terms like evaporation, sublimation, condensation, etc.? Perhaps some mash-up of adsorption and dissolution?
- Is this process akin to a phase change in some way? For example, if I had a sealed box of air with a dish of salt and a beaker of water, and I could ramp the temperature slowly enough, would I see a plateau at a certain humidity as the salt hit a threshold and started absorbing water until saturated?
Some may be familliar with the Morton Salt logo and slogan "When it rains, it pours" meaning that other moisture-absorbing materials in the package will keep the sodium chloride as table salt from absorbing too much water and becoming stuck and un-pourable:
Source
everyday-chemistry water phase deliquescence
asked May 4 at 9:13
uhohuhoh
2,3261648
$endgroup$
I have some spilled un-iodized table salt (NaCl). It is very humid where I live, and when it gets very humid for a few days, the salt absorbs so much water that it becomes a puddle of (probably) saturated salt water. When the humidity drops for a few days, the water evaporates and I have dry salt crystals again. This is repeatable.
My questions about this process are:
- What is this process called exactly? As far as I understand "deliquescence" is a property and not a process. Does the exchange of water between my pile of salt and the air have a specific terminology? Something that would go along with terms like evaporation, sublimation, condensation, etc.? Perhaps some mash-up of adsorption and dissolution?
- Is this process akin to a phase change in some way? For example, if I had a sealed box of air with a dish of salt and a beaker of water, and I could ramp the temperature slowly enough, would I see a plateau at a certain humidity as the salt hit a threshold and started absorbing water until saturated?
Some may be familliar with the Morton Salt logo and slogan "When it rains, it pours" meaning that other moisture-absorbing materials in the package will keep the sodium chloride as table salt from absorbing too much water and becoming stuck and un-pourable:
Source
everyday-chemistry water phase deliquescence
everyday-chemistry water phase deliquescence
asked May 4 at 9:13
uhohuhoh
2,3261648
asked May 4 at 9:13
uhohuhoh
2,3261648
edited May 4 at 9:35
uhoh
asked May 4 at 9:13
uhohuhoh
2,3261648
asked May 4 at 9:13
uhohuhoh
2,3261648
asked May 4 at 9:13
uhohuhoh
2,3261648
2,3261648
$begingroup$
Well, hygroscopic comes to mind, and condensation. It is a phase transition. Initially, it may be considered a condensation reaction (a process on the surface of salt crystals, possibly with water migrating into the crystal). At some point, it is transtion from water in the gas phase to water in a saturated NaCl solution. In other words, this involves multiple stages as you move from hydrated crystals to solvated salt ions.
$endgroup$
– Night Writer
May 4 at 9:28
$begingroup$
@NightWriter "hygroscopicity" is a property, not a process, and condensation takes place without any hygroscopic materials being present. Also I don't think NaCl has a hydrated form. update: wait, maybe it does! en.wikipedia.org/wiki/Water_of_crystallization
$endgroup$
– uhoh
May 4 at 9:33
1
$begingroup$
See also chemistry.stackexchange.com/a/112915/35806
$endgroup$
– Poutnik
May 4 at 9:56
1
$begingroup$
NaCl does not have a hydrated form. It simply adsorbs water at its surface, which starts dissolving. When this surface phase becomes thick enough, it coalesces into one continous, NaCl saturated liquid phase, with residual salt particles still in it.
$endgroup$
– Karl
May 4 at 10:16
1
$begingroup$
also See also chemistry.stackexchange.com/a/63901/16035
$endgroup$
– uhoh
May 4 at 11:12
|
show 1 more comment
$begingroup$
Well, hygroscopic comes to mind, and condensation. It is a phase transition. Initially, it may be considered a condensation reaction (a process on the surface of salt crystals, possibly with water migrating into the crystal). At some point, it is transtion from water in the gas phase to water in a saturated NaCl solution. In other words, this involves multiple stages as you move from hydrated crystals to solvated salt ions.
$endgroup$
– Night Writer
May 4 at 9:28
$begingroup$
@NightWriter "hygroscopicity" is a property, not a process, and condensation takes place without any hygroscopic materials being present. Also I don't think NaCl has a hydrated form. update: wait, maybe it does! en.wikipedia.org/wiki/Water_of_crystallization
$endgroup$
– uhoh
May 4 at 9:33
1
$begingroup$
See also chemistry.stackexchange.com/a/112915/35806
$endgroup$
– Poutnik
May 4 at 9:56
1
$begingroup$
NaCl does not have a hydrated form. It simply adsorbs water at its surface, which starts dissolving. When this surface phase becomes thick enough, it coalesces into one continous, NaCl saturated liquid phase, with residual salt particles still in it.
$endgroup$
– Karl
May 4 at 10:16
1
$begingroup$
also See also chemistry.stackexchange.com/a/63901/16035
$endgroup$
– uhoh
May 4 at 11:12
$begingroup$
Well, hygroscopic comes to mind, and condensation. It is a phase transition. Initially, it may be considered a condensation reaction (a process on the surface of salt crystals, possibly with water migrating into the crystal). At some point, it is transtion from water in the gas phase to water in a saturated NaCl solution. In other words, this involves multiple stages as you move from hydrated crystals to solvated salt ions.
$endgroup$
– Night Writer
May 4 at 9:28
$begingroup$
Well, hygroscopic comes to mind, and condensation. It is a phase transition. Initially, it may be considered a condensation reaction (a process on the surface of salt crystals, possibly with water migrating into the crystal). At some point, it is transtion from water in the gas phase to water in a saturated NaCl solution. In other words, this involves multiple stages as you move from hydrated crystals to solvated salt ions.
$endgroup$
– Night Writer
May 4 at 9:28
$begingroup$
@NightWriter "hygroscopicity" is a property, not a process, and condensation takes place without any hygroscopic materials being present. Also I don't think NaCl has a hydrated form. update: wait, maybe it does! en.wikipedia.org/wiki/Water_of_crystallization
$endgroup$
– uhoh
May 4 at 9:33
$begingroup$
@NightWriter "hygroscopicity" is a property, not a process, and condensation takes place without any hygroscopic materials being present. Also I don't think NaCl has a hydrated form. update: wait, maybe it does! en.wikipedia.org/wiki/Water_of_crystallization
$endgroup$
– uhoh
May 4 at 9:33
1
1
$begingroup$
See also chemistry.stackexchange.com/a/112915/35806
$endgroup$
– Poutnik
May 4 at 9:56
$begingroup$
See also chemistry.stackexchange.com/a/112915/35806
$endgroup$
– Poutnik
May 4 at 9:56
1
1
$begingroup$
NaCl does not have a hydrated form. It simply adsorbs water at its surface, which starts dissolving. When this surface phase becomes thick enough, it coalesces into one continous, NaCl saturated liquid phase, with residual salt particles still in it.
$endgroup$
– Karl
May 4 at 10:16
$begingroup$
NaCl does not have a hydrated form. It simply adsorbs water at its surface, which starts dissolving. When this surface phase becomes thick enough, it coalesces into one continous, NaCl saturated liquid phase, with residual salt particles still in it.
$endgroup$
– Karl
May 4 at 10:16
1
1
$begingroup$
also See also chemistry.stackexchange.com/a/63901/16035
$endgroup$
– uhoh
May 4 at 11:12
$begingroup$
also See also chemistry.stackexchange.com/a/63901/16035
$endgroup$
– uhoh
May 4 at 11:12
|
show 1 more comment
1 Answer
1
active
oldest
votes
$begingroup$
What is this process called exactly? As far as I understand
"deliquescence" is a property and not a process. Does the exchange of
water between my pile of salt and the air have a specific terminology?
Something that would go along with terms like evaporation,
sublimation, condensation, etc.? Perhaps some mash-up of adsorption
and dissolution?
The property of salts to become wet as I mentioned in another post Scientific Reason for Salt Solution Gaining Volume is deliquescence. The corresponding verb is to deliquesce. It is a pretty old word. From OED (not open access):
To melt or become liquid by absorbing moisture from the air, as certain salts.
1756 C. Lucas Ess. Waters i. 14 They attract the humidity of the
air, and deliquesce, or run liquid.
1781 Philos. Trans. 1780 (Royal Soc.) 70 349 This
pot-ash..deliquesces a little in moist air.
1876 D. Page Adv. Text-bk. Geol. (ed. 6) xvi. 299 Pure chloride of
sodium is not liable to deliquesce.*
Regarding phase changes, there were many phases changes involved in that process. The water as gas became liquid. The solid NaCl phase become one phase with a liquid. Once it evaporated, you got the solid again.
edited May 4 at 16:34
Night Writer
3,214426
answered May 4 at 12:37
M. FarooqM. Farooq
2,880316
$endgroup$
$begingroup$
Thank you for the historical references! For item #2, would you expect such a plateau?
$endgroup$
– uhoh
May 4 at 12:47
2
$begingroup$
@uhoh The salty solution with excess of solid salt, or solid salt alone, would try to keep the relative humidity at 75%, until all salts dissolves. Then the humidity will raise, until the saturated vapour pressure above the diluted salt solution equals the vapour pressure. Note that relative humidity above saturated solution is temperature dependent, see the provided link.
$endgroup$
– Poutnik
May 4 at 13:11
$begingroup$
@Poutnik If you would like to add an answer here, not just linking-to, but actually citing from and explaining Humidity Fixed Points that would be excellent!
$endgroup$
– uhoh
May 4 at 13:21
$begingroup$
It was not nice to provide a big PDF link without warning to expiring mobile data plan. :-)
$endgroup$
– Poutnik
May 4 at 13:44
$begingroup$
@Poutnik sorry, I don't even have a mobile data plan, lucky you! :-) I'll try to remember to flag pdfs in the future.
$endgroup$
– uhoh
May 4 at 13:59
add a comment |
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$begingroup$
What is this process called exactly? As far as I understand
"deliquescence" is a property and not a process. Does the exchange of
water between my pile of salt and the air have a specific terminology?
Something that would go along with terms like evaporation,
sublimation, condensation, etc.? Perhaps some mash-up of adsorption
and dissolution?
The property of salts to become wet as I mentioned in another post Scientific Reason for Salt Solution Gaining Volume is deliquescence. The corresponding verb is to deliquesce. It is a pretty old word. From OED (not open access):
To melt or become liquid by absorbing moisture from the air, as certain salts.
1756 C. Lucas Ess. Waters i. 14 They attract the humidity of the
air, and deliquesce, or run liquid.
1781 Philos. Trans. 1780 (Royal Soc.) 70 349 This
pot-ash..deliquesces a little in moist air.
1876 D. Page Adv. Text-bk. Geol. (ed. 6) xvi. 299 Pure chloride of
sodium is not liable to deliquesce.*
Regarding phase changes, there were many phases changes involved in that process. The water as gas became liquid. The solid NaCl phase become one phase with a liquid. Once it evaporated, you got the solid again.
edited May 4 at 16:34
Night Writer
3,214426
answered May 4 at 12:37
M. FarooqM. Farooq
2,880316
$endgroup$
$begingroup$
Thank you for the historical references! For item #2, would you expect such a plateau?
$endgroup$
– uhoh
May 4 at 12:47
2
$begingroup$
@uhoh The salty solution with excess of solid salt, or solid salt alone, would try to keep the relative humidity at 75%, until all salts dissolves. Then the humidity will raise, until the saturated vapour pressure above the diluted salt solution equals the vapour pressure. Note that relative humidity above saturated solution is temperature dependent, see the provided link.
$endgroup$
– Poutnik
May 4 at 13:11
$begingroup$
@Poutnik If you would like to add an answer here, not just linking-to, but actually citing from and explaining Humidity Fixed Points that would be excellent!
$endgroup$
– uhoh
May 4 at 13:21
$begingroup$
It was not nice to provide a big PDF link without warning to expiring mobile data plan. :-)
$endgroup$
– Poutnik
May 4 at 13:44
$begingroup$
@Poutnik sorry, I don't even have a mobile data plan, lucky you! :-) I'll try to remember to flag pdfs in the future.
$endgroup$
– uhoh
May 4 at 13:59
add a comment |
$begingroup$
What is this process called exactly? As far as I understand
"deliquescence" is a property and not a process. Does the exchange of
water between my pile of salt and the air have a specific terminology?
Something that would go along with terms like evaporation,
sublimation, condensation, etc.? Perhaps some mash-up of adsorption
and dissolution?
The property of salts to become wet as I mentioned in another post Scientific Reason for Salt Solution Gaining Volume is deliquescence. The corresponding verb is to deliquesce. It is a pretty old word. From OED (not open access):
To melt or become liquid by absorbing moisture from the air, as certain salts.
1756 C. Lucas Ess. Waters i. 14 They attract the humidity of the
air, and deliquesce, or run liquid.
1781 Philos. Trans. 1780 (Royal Soc.) 70 349 This
pot-ash..deliquesces a little in moist air.
1876 D. Page Adv. Text-bk. Geol. (ed. 6) xvi. 299 Pure chloride of
sodium is not liable to deliquesce.*
Regarding phase changes, there were many phases changes involved in that process. The water as gas became liquid. The solid NaCl phase become one phase with a liquid. Once it evaporated, you got the solid again.
edited May 4 at 16:34
Night Writer
3,214426
answered May 4 at 12:37
M. FarooqM. Farooq
2,880316
$endgroup$
$begingroup$
Thank you for the historical references! For item #2, would you expect such a plateau?
$endgroup$
– uhoh
May 4 at 12:47
2
$begingroup$
@uhoh The salty solution with excess of solid salt, or solid salt alone, would try to keep the relative humidity at 75%, until all salts dissolves. Then the humidity will raise, until the saturated vapour pressure above the diluted salt solution equals the vapour pressure. Note that relative humidity above saturated solution is temperature dependent, see the provided link.
$endgroup$
– Poutnik
May 4 at 13:11
$begingroup$
@Poutnik If you would like to add an answer here, not just linking-to, but actually citing from and explaining Humidity Fixed Points that would be excellent!
$endgroup$
– uhoh
May 4 at 13:21
$begingroup$
It was not nice to provide a big PDF link without warning to expiring mobile data plan. :-)
$endgroup$
– Poutnik
May 4 at 13:44
$begingroup$
@Poutnik sorry, I don't even have a mobile data plan, lucky you! :-) I'll try to remember to flag pdfs in the future.
$endgroup$
– uhoh
May 4 at 13:59
add a comment |
$begingroup$
What is this process called exactly? As far as I understand
"deliquescence" is a property and not a process. Does the exchange of
water between my pile of salt and the air have a specific terminology?
Something that would go along with terms like evaporation,
sublimation, condensation, etc.? Perhaps some mash-up of adsorption
and dissolution?
The property of salts to become wet as I mentioned in another post Scientific Reason for Salt Solution Gaining Volume is deliquescence. The corresponding verb is to deliquesce. It is a pretty old word. From OED (not open access):
To melt or become liquid by absorbing moisture from the air, as certain salts.
1756 C. Lucas Ess. Waters i. 14 They attract the humidity of the
air, and deliquesce, or run liquid.
1781 Philos. Trans. 1780 (Royal Soc.) 70 349 This
pot-ash..deliquesces a little in moist air.
1876 D. Page Adv. Text-bk. Geol. (ed. 6) xvi. 299 Pure chloride of
sodium is not liable to deliquesce.*
Regarding phase changes, there were many phases changes involved in that process. The water as gas became liquid. The solid NaCl phase become one phase with a liquid. Once it evaporated, you got the solid again.
edited May 4 at 16:34
Night Writer
3,214426
answered May 4 at 12:37
M. FarooqM. Farooq
2,880316
$endgroup$
What is this process called exactly? As far as I understand
"deliquescence" is a property and not a process. Does the exchange of
water between my pile of salt and the air have a specific terminology?
Something that would go along with terms like evaporation,
sublimation, condensation, etc.? Perhaps some mash-up of adsorption
and dissolution?
The property of salts to become wet as I mentioned in another post Scientific Reason for Salt Solution Gaining Volume is deliquescence. The corresponding verb is to deliquesce. It is a pretty old word. From OED (not open access):
To melt or become liquid by absorbing moisture from the air, as certain salts.
1756 C. Lucas Ess. Waters i. 14 They attract the humidity of the
air, and deliquesce, or run liquid.
1781 Philos. Trans. 1780 (Royal Soc.) 70 349 This
pot-ash..deliquesces a little in moist air.
1876 D. Page Adv. Text-bk. Geol. (ed. 6) xvi. 299 Pure chloride of
sodium is not liable to deliquesce.*
Regarding phase changes, there were many phases changes involved in that process. The water as gas became liquid. The solid NaCl phase become one phase with a liquid. Once it evaporated, you got the solid again.
edited May 4 at 16:34
Night Writer
3,214426
answered May 4 at 12:37
M. FarooqM. Farooq
2,880316
edited May 4 at 16:34
Night Writer
3,214426
edited May 4 at 16:34
Night Writer
3,214426
edited May 4 at 16:34
Night Writer
3,214426
3,214426
answered May 4 at 12:37
M. FarooqM. Farooq
2,880316
answered May 4 at 12:37
M. FarooqM. Farooq
2,880316
answered May 4 at 12:37
M. FarooqM. Farooq
2,880316
2,880316
$begingroup$
Thank you for the historical references! For item #2, would you expect such a plateau?
$endgroup$
– uhoh
May 4 at 12:47
2
$begingroup$
@uhoh The salty solution with excess of solid salt, or solid salt alone, would try to keep the relative humidity at 75%, until all salts dissolves. Then the humidity will raise, until the saturated vapour pressure above the diluted salt solution equals the vapour pressure. Note that relative humidity above saturated solution is temperature dependent, see the provided link.
$endgroup$
– Poutnik
May 4 at 13:11
$begingroup$
@Poutnik If you would like to add an answer here, not just linking-to, but actually citing from and explaining Humidity Fixed Points that would be excellent!
$endgroup$
– uhoh
May 4 at 13:21
$begingroup$
It was not nice to provide a big PDF link without warning to expiring mobile data plan. :-)
$endgroup$
– Poutnik
May 4 at 13:44
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@Poutnik sorry, I don't even have a mobile data plan, lucky you! :-) I'll try to remember to flag pdfs in the future.
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– uhoh
May 4 at 13:59
add a comment |
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Thank you for the historical references! For item #2, would you expect such a plateau?
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– uhoh
May 4 at 12:47
2
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@uhoh The salty solution with excess of solid salt, or solid salt alone, would try to keep the relative humidity at 75%, until all salts dissolves. Then the humidity will raise, until the saturated vapour pressure above the diluted salt solution equals the vapour pressure. Note that relative humidity above saturated solution is temperature dependent, see the provided link.
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– Poutnik
May 4 at 13:11
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@Poutnik If you would like to add an answer here, not just linking-to, but actually citing from and explaining Humidity Fixed Points that would be excellent!
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– uhoh
May 4 at 13:21
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It was not nice to provide a big PDF link without warning to expiring mobile data plan. :-)
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– Poutnik
May 4 at 13:44
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@Poutnik sorry, I don't even have a mobile data plan, lucky you! :-) I'll try to remember to flag pdfs in the future.
$endgroup$
– uhoh
May 4 at 13:59
$begingroup$
Thank you for the historical references! For item #2, would you expect such a plateau?
$endgroup$
– uhoh
May 4 at 12:47
$begingroup$
Thank you for the historical references! For item #2, would you expect such a plateau?
$endgroup$
– uhoh
May 4 at 12:47
2
2
$begingroup$
@uhoh The salty solution with excess of solid salt, or solid salt alone, would try to keep the relative humidity at 75%, until all salts dissolves. Then the humidity will raise, until the saturated vapour pressure above the diluted salt solution equals the vapour pressure. Note that relative humidity above saturated solution is temperature dependent, see the provided link.
$endgroup$
– Poutnik
May 4 at 13:11
$begingroup$
@uhoh The salty solution with excess of solid salt, or solid salt alone, would try to keep the relative humidity at 75%, until all salts dissolves. Then the humidity will raise, until the saturated vapour pressure above the diluted salt solution equals the vapour pressure. Note that relative humidity above saturated solution is temperature dependent, see the provided link.
$endgroup$
– Poutnik
May 4 at 13:11
$begingroup$
@Poutnik If you would like to add an answer here, not just linking-to, but actually citing from and explaining Humidity Fixed Points that would be excellent!
$endgroup$
– uhoh
May 4 at 13:21
$begingroup$
@Poutnik If you would like to add an answer here, not just linking-to, but actually citing from and explaining Humidity Fixed Points that would be excellent!
$endgroup$
– uhoh
May 4 at 13:21
$begingroup$
It was not nice to provide a big PDF link without warning to expiring mobile data plan. :-)
$endgroup$
– Poutnik
May 4 at 13:44
$begingroup$
It was not nice to provide a big PDF link without warning to expiring mobile data plan. :-)
$endgroup$
– Poutnik
May 4 at 13:44
$begingroup$
@Poutnik sorry, I don't even have a mobile data plan, lucky you! :-) I'll try to remember to flag pdfs in the future.
$endgroup$
– uhoh
May 4 at 13:59
$begingroup$
@Poutnik sorry, I don't even have a mobile data plan, lucky you! :-) I'll try to remember to flag pdfs in the future.
$endgroup$
– uhoh
May 4 at 13:59
add a comment |
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Well, hygroscopic comes to mind, and condensation. It is a phase transition. Initially, it may be considered a condensation reaction (a process on the surface of salt crystals, possibly with water migrating into the crystal). At some point, it is transtion from water in the gas phase to water in a saturated NaCl solution. In other words, this involves multiple stages as you move from hydrated crystals to solvated salt ions.
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– Night Writer
May 4 at 9:28
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@NightWriter "hygroscopicity" is a property, not a process, and condensation takes place without any hygroscopic materials being present. Also I don't think NaCl has a hydrated form. update: wait, maybe it does! en.wikipedia.org/wiki/Water_of_crystallization
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– uhoh
May 4 at 9:33
1
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See also chemistry.stackexchange.com/a/112915/35806
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– Poutnik
May 4 at 9:56
1
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NaCl does not have a hydrated form. It simply adsorbs water at its surface, which starts dissolving. When this surface phase becomes thick enough, it coalesces into one continous, NaCl saturated liquid phase, with residual salt particles still in it.
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– Karl
May 4 at 10:16
1
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also See also chemistry.stackexchange.com/a/63901/16035
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– uhoh
May 4 at 11:12