First slide

Theory of dilute solutions

Question

The molal depression constant for water is 1.86 $°$ C. The freezing point of a 0.05-molal solution of a non-electrolyte in water is

Moderate

A

-1.86 $°$ C
B

-.0.93 $°$ C
C

-0.093 $°$ C
D

0.93 $°$ C

Solution

$∆ T_{f} = K_{f} \times M o l a l i t y = 1.86 \times 0.05 = 0.093 T h u s, f r e e z i n g p o i n t = 0 - 0.093 = - 0.093$

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