First slide

Theory of dilute solutions

Question

An aqueous solution containing an ionic salt having molality equal to 0.19 freezes at -0.704 $°$ C. The Van't Hoff factor of the ionic salt nearly is (K_f for water = 1.86 K m^-1)

Moderate

A

3
B

2
C

4
D

5

Solution

$∆ T_{f} = i K_{f} m \Rightarrow 0.704 = i \times 1.86 \times 0.19 \Rightarrow i = 2$

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