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Question

pH of resultant solution formed by mixing equal volumes of two solutions having pH=5.8 and pH=12.8 is

A
12.5
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B
5.5
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C
6.1
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D
13.1
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Solution

The correct option is A 12.5
pH=12.8
pOH=1.2
[OH]=101.2
pH=5.8
[H+]=105.8
105.8<<101.2
by mixing these two solutions, there will be very less change in pH and therefore acid is added, so pH will be decreased by a very small value.
So net pH of final solution is around 12.5

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