Wednesday, March 21, 2007

Determine the molar mass of an unknown compound by making asolution in which lauric acid is the solvent and the unknown is the solute.After you determine the freezing point of this solution, you’ll be able to applythe following equation:

D T = i x m x Kf , where

i = the number of solute particles (in this case i= 1; for molecular, nonionizing solutes i always =1);
m = the molality of the solution;
Kf = the freezing point depression constant for lauric acid ( 3.9 o C/m); and
D T = the difference in the freezing points of the solvent and the solution.

Extracted from Lab Practical: Determination of the Molar Mass of an Unknown Compound

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