Freezing Point?..................

Question

What is the freezing point of an aqueous 2.65 m calcium chloride (CaCl2) solution? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/m.

Answer 1

I suggest to my students that they always start with the mathematical expression.

DT = i k(f) m

DT = 3 x 1.86 C/m x 2.65 m

DT = 14.8 C

The new freezing point is -14.8C

Answer 2

This site might help you:

http://en.wikipedia.org/wiki/Calcium_chl...

Answer 3

2.65 m calcium chloride (CaCl2)  turns lose triple that in ions = 7.95m

7.95m @ 1.86 C / m = 14.8 C drop

your answer is - 14.8C