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An acidic buffer contains equal concentrations of acid and salt. The dissociation constant of acid is 10-5. The pH of the buffer solution is

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a
5
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9
c
4.49
d
5.5

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detailed solution

Correct option is A

Given data: It is given to find out pH of a buffer solution which contains equal concentrations of acid and salt & the dissociation constant of acid is 10-5

Concept used:pKa=-log[Ka, pH = pKa+log[salt][acid]

Explanation: pKa=-log[Ka] = -log[10-5] = 5

pH =pKa+log[salt][acid]

since [acid] = [salt]

= 5 + 0 = 5

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