October 8, 2015

Homework Help: Chemistry

Posted by Anonymous on Wednesday, February 25, 2009 at 11:44am.

If the same solute is dissolved in two different solvents to the same concentration and the same temperature, the osmotic pressure ____

My answer & reason: solution A has a smaller molecular weight and therefore, a larger Molarity and higher osmotic pressure (pi=iMRT)

Potassium chloride is used in the kitchen as a salt substitute (in place of sodium chloride). Suppose you were planning to make ice cream but discovered too late that you were out of table salt for making the ice bath. If the recipe called for one pound of NaCl, how would it work to use one pound of KCl instead?

My answer & reason:
so the 1 lb of KCl produces less moles than 1lb of NaCl because the molecular weight of KCl is greater than the molecular weight of NaCl? therefore, the molarity for KCl is less than the molarity for NaCl. As a result, KCl has a slightly higher freezing point (due to dTb=ikm).

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