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Question

The pKa of a weak acid is 5.85. The concentration of the acid and its conjugate base are equal at a pH of:

A
2.93
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B
5.85
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C
4.85
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D
7.85
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Solution

The correct option is B 5.85
Given that,
[Acid]=[Conj. base]

For weak acid,

pH=pKa+log[Conj. base][Acid]=pKa+log1=5.85.

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