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Question

pH of a solution produced when aqueous solution of pH=6 is mixed with an equal volume of an aqueous solution of pH=3 is about:

A
4.3
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B
3.3
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C
4.0
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D
4.5
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Solution

The correct option is A 3.3
The pH of solution is negative logarithm of hydrogen ion concentration.
pH=log[H+]
Hence, [H+]=10pH
pH=3 and pH=6 corresponds to hydrogen ion concentrations of 0.001M and 0.000001M respectively.
Assuming 1L of each solution is mixed,
the concentration of resulting solution is 0.001M+0.000001M2=0.0005M.
pH=log[H+]=log(0.0005)=3.3

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