On Monday, December 11, 2017 at 7:33:50 PM UTC-6, Oumati Asami wrote:

On 11/12/2017 14:17, Alaia wrote:

On Thursday, 2 April 1998 16:00:00 UTC+8, CINDY SMITH wrote:

Why does salt water evaporate faster than fresh water? My science is a bit
sketchy. From what I understand (I'm an English major, forgive me), salt water
evaporates faster because the atomic charge of salt water is different from
that of fresh water. Salt, I think, also absorbs water? I've heard that >> rubbing salt in an open wound causes the wound to heal faster because salt
absorbs blood, for example. Salt somehow changes the molecular balance of >> water. Am I on the right track? Can someone recommend a book I can find in a
library that answers the question? Sorry if the question is too basic.

Thanks!

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When NaCl dissolves in water, Na+ and Cl- ions form ion-dipole interaction with water.

As water is evaporated from salt water, less water is available to form ion-dipole interaction with Na+ and Cl- ions. This results more ionic bonds between Na+ and Cl- to be formed, releasing heat energy to further evaporate more water in salt water.

Hope this helps.

Alaia
A-level Chemistry teacher in Singapore

In water, sodium and chloride ions are solvated. I don't think ionic
bond between sodium and chloride ions is possible in water unless salt starts to crystallize out of water. But then, that's ionic bond in
sodium chloride crystal, not in water.

Also, the title is against Raoult's law.

Yada, yada, yada...I have an idea, conduct the experiment and find out which one evaporates faster...I could tell you, but then that would defeat the process of learning and finding out for yourself...spoiler alert, a lot of the responses on here are
WRONG!

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