First slide

Theory of dilute solutions

Question

25 mL of an aqueous solution of KCI was found to require 20 mL of 1 M AgNO₃ solution when titrated using a K₂CrO₄ as indicator. The depression in freezing point of KCI solution with 100% ionization will be:
[K_f = 2.0 $°$ C mol^-1 kg and molarity = molality]

Moderate

A

5.0 $°$ C
B

3.2 $°$ C
C

1.6 $°$ C
D

0.8 $°$ C

Solution

$25 \times M_{(K C I)} = 20 \times 1 M_{(A g N O_{3})} ∴ M_{(K C I)} = 0.8 ∆ T_{f} = M' K_{f} i = 0.8 \times 2 \times 2 = 3.2 °$

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