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9 Cards in this Set
- Front
- Back
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What happens to the boiling and the freezing point, when a solid solute is added to a liquid solvent? And what is this dependent upon?
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the boiling point increases, while the freezing point decreases, and these factors are dependent upon the amount of solute
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What is the formula for boiling point elevavtion, and what do the variables stand for
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T=kb x m x i
kb= boiling point elevation constant m= molality i= number of dissolved particles produced by each molecule of solute |
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What is the formula for freezing point depression, and what do the varibales stand for
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T= kf x m x i
kf= freezing point depression constant m= molality i= number of dissolved particles produced by each molecule of solute |
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In order to make inferences about compounds based on the vapor pressure what do you have to remember
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-that its more diffiuclt for surface liquids to evaporate if the liquid has strong bonds to hold it back
-if vapor pressure is high; intermolecular forces are weak -once you know that you can make inferences about the BP, heat of fusion and heat of vaporization -when the vapor pressure of a liquid is equal to the surrounding atmospheric pressure, the liquid boils |
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If you add some solid solute to any solution what would happen to the vapor pressure and why?
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the vapor pressure would decrease, beacuase the solute that has been added takes up surface area at the exposed part of the liquid, which means less solvent can evaporate
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If you were to heat up the solution what would happen to the vapor pressure and why
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the vapor pressure would increase, beacsue the heat encourages more of the surface liquid to evaporate
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If a liquid has high vapor pressure what is it called, abd why?
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it means its volatile and it readily evaporates, like rubbing alcohol
-this happens when the intermolecular forces of a liquid are not strong |
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When is you add solid solute to a solution, what happens to the vapor pressure, BP, and FP
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-Vapor pressure: is lowered
-Boiling Point: raised -Freezing Point: lowered |
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What is the equation for raoults law?
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-it is used with liquid solutes
-P(total)= X(solvent)P(solvent) + X(solute)P(solute) -Solutions with negative heats of solution tend to have a negtive deviation from rauolts law (the actual vapor pressure will be less that that given by the equation -Solutions with positive heats of solution tend to have a positive deviation from raoults law (the actual vpaor pressure will be greater then that given by the equation) |
