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Q.

25 mL of an aqueous solution of KCl was found to require 20 mL of 1 M AgNO₃ solution when titrated using K₂CrO₄ as an indicator. What is the depression in freezing point of KCl solution of the concentration? ___________(Nearest integer).
(Given: (K_f = 2.0 Kg mol^-1)
Assume 1) 100% ionization and
2) density of the aqeous solution as 1 g mL^-1

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answer is 3.

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Detailed Solution

25 x M = 20 x 1
M = 0.8(KCl)
$\begin{array}{l} KCl \to K^{+} + {Cl}^{-} \\ \begin{array}{lll} 0.8 & 0 & 0 \end{array} \\ \begin{array}{lll} 0 & 0.8 & 0.8 \end{array} {ΔT}_{f} = i \times K_{f} \times m = 1.6 \times 2 = 3.2 \end{array}$

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25 mL of an aqueous solution of KCl was found to require 20 mL of 1 M AgNO3 solution when titrated using K2CrO4 as an indicator. What is the depression in freezing point of KCl solution of the concentration? ___________(Nearest integer).(Given: (Kf = 2.0 Kg mol-1)Assume 1) 100% ionization and2) density of the aqeous solution as 1 g mL-1