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Question

The pH of an aqueous solution at 25C having 0.1 M NaOH and 0.3 M to acetic acid (pKa = 4.76) would be nearly


A

4.25

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B

4.45

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C

4.75

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D

5.05

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Solution

The correct option is B

4.45


pH = pKalog[acid][salt]

0.1 M NaOH will react with acid to form 0.1 M CH3COONa and therefore 0.3 CH3­COOH will be reduced to 0.2 M.

pH = 4.76 – log0.20.1 = 4.45


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