Question

A `0.2` molal aqueous solution of a weak acid `HX` is `20%` ionized. The freezing point of the solution is `(k_(f) = 1.86 K kg "mole"^(-1)` for water):
A. `-0.45^(@)C`
B. `-0.9^(@)C`
C. `-0.31^(@)C`
D. `-0.53^(@)C`

Answer 1

Correct Answer - A
`-(T-0) = 1.2 xx 0.2 xx 1.86`
`T =- 0.45^(@)C`