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The effect of salt on the temperature of water

 
 
Reply Sun 4 Jan, 2015 04:34 am
Does adding salt to boiling water decrease the vapor pressure of the solution or the atmosphere?
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Type: Question • Score: 0 • Views: 796 • Replies: 1
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fresco
 
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Reply Sun 4 Jan, 2015 12:10 pm
@Spatel5130 ,
http://en.wikipedia.org/wiki/Boiling-point_elevation
Quote:
Put in vapor pressure terms, a liquid boils at the temperature when its vapor pressure equals the surrounding pressure. For the solvent, the presence of the solute decreases its vapor pressure by dilution. A non-volatile solute has a vapor pressure of zero, so the vapor pressure of the solution is less than the vapor pressure of the solvent. Thus, a higher temperature is needed for the vapor pressure to reach the surrounding pressure, and the boiling point is elevated.
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