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Question

The pH of solution on mixing equal volume of solution having pH = 3 and pH = 4 is: [log5.5=0.7404]

A
3.38
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B
3.5
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C
3.26
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D
4
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Solution

The correct option is C 3.26
pH1=3
[H+]1=103
Similarily,
[H+]2=105
In the final solution, the concentration of H+ ion is given by,
[H+]=105+1032
[H+]=5.5×104
Therefore, pH of the solution is given by,
pH=log[H+]
pH=log(5.5×104)
pH=3.26

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