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Topic: How do I do this?  (Read 1773 times)

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Offline Zoloft

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How do I do this?
« on: February 13, 2009, 01:10:09 PM »
The first problem is:
Calculate the boiling point and freezing point of a solution prepared by dissolving 4.9 grams of
sucrose (M.W. 342 grams/mole) in 175 grams if water.


Anyway, I know what Tf and Tb are, which come out to 100.04 C and 0.077 C


But the next question asks "For the same change in the freezing temperature (:delta: Tf), solvent A needs twice as much solute as solvent B. Which solvent has the greatest Kf value? Explain.

Uh.  ???

Offline Borek

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Re: How do I do this?
« Reply #1 on: February 13, 2009, 05:27:16 PM »
If solvent requires 1 g of sucrose per 100g of solvent to change freezing temp by 1 deg C, what is its Kf?

If other solvent requires 2 g of sucrose per 100g of solvent to change freezing temp by 1 deg C, what is its Kf?

Which has greater Kf?
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