In a 0.2 molal aqueous solution of a weak acid HX the degree of ionization is 0.3 . Taking k f for water as 1.85 , the freezing point of the solution will be nearest to

Question

In a 0.2 molal aqueous solution of a weak acid HX the degree of ionization is 0.3 . Taking k f ​ for water as 1.85 , the freezing point of the solution will be nearest to

TestHub · Accepted Answer

Concepts: Colligative properties, depression in freezing point, van't Hoff factor.

Solution:

$Δ T_{f} = i \cdot K_{f} \cdot m$ .

$i = 1 + α = 1 + 0.3 = 1.3$ .

$Δ T_{f} = 1.3 \cdot 1.85 \cdot 0.2 = 0.48 1^{\circ} C$ .

Freezing point $= - 0.48 1^{\circ} C$ .

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