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Question

Equal volume of solutions of pH values 1,3,5 and 6 are mixed. The pH of resultant solution is nearly:

A
1.3
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B
2.7
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C
1.6
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D
3.6
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Solution

The correct option is B 1.6
The pH of solution is the negative logarithm of hydrogen ion concentration.
pH=log[H+].
Hence, [H+]=10pH
pH of values 1,3,5 and 6 corresponds to hydrogen ion concentrations of 0.1M, 0.001M, 0.00001M and 0.000001M respectively.

Assume that 1 L of each solution is mixed.
The concentration of the resulting solution is 0.1M+0.001M+0.00001M+0.000001M4=0.025253 M.
pH=log[H+]=log(0.025253)=1.6.
Hence, the pH of the resultant solution is 1.6.

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