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The freezing point of 0.20M solution of ...

The freezing point of `0.20M` solution of weak acid `HA` is `272.5K`. The molality of the solution is `0.263mol Kg^(-1)`.
a. Find the `pH` of the solution on adding `0.25m` solution of acetate of the above solution.
b. Find the `pH` of the solution on adding `0.20M` solution of `NaOH`. Given: `K_(f)` of water `= 1.86 Km^(-1)`

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