A 0.5 molal aqueous solution of a weak a...

A 0.5 molal aqueous solution of a weak acid (HX) is 20 percent ionized. The lowering in freezing point of this solution is (`K_f` = 1.86 K/m for water)

1.12 K

`-0.56`

0.56 K

`-1.12` K

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