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  • What will be the change in freezing point if sodium sulphate is completely dissociated into cation and anions in aqueous solution, when 0.05 mol of sodium sulphate is dissolved in 1 kg of wate

What will be the change in freezing point if sodium sulphate is completely dissociated into cation and anions in aqueous solution, when 0.05 mol of sodium sulphate is dissolved in 1 kg of water?

Option: 1

0.28


Option: 2

0.346


Option: 3

0.478


Option: 4

0.279


Answers (1)

best_answer

\begin{aligned} & \mathrm{\Delta T_f=i \mathrm{k_f} \cdot m} \\ \\& \begin{aligned} \text {i for } \mathrm{Na}_2 \mathrm{SO}_4=3 \end{aligned} \\ \\& \begin{aligned} \therefore \; \mathrm{\Delta T_f} & =3 \times 1.86 \times \frac{0.05}{1} . \\ \\& =0.279 \mathrm{~K} \end{aligned} \end{aligned}

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