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Question

pH of the solution produced by mixing equal volumes of 2×103 M HClO4 and 1×102 M KClO4 will be:

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Solution

Let volume of each solution be V ml
Moles of [H+]=2×103×V moles
Final volume, Vf=2V ml
[H+]=2×103×V2V=103 M
We know,
pH=log[H+]
pH=log103=3
Since KClO4 is a neutral salt, thus it does not affect the pH of the solution.

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