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Calculate the pH of a mixture of 0.10M acetic acid and 0.20M sodium acetate. The pKa  of acetic acid is 4.76.

(a) 5.1

(b) 4.1

(c) 6.1

(d) 7.1

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Correct choice is (a) 5.1

The explanation: pH = pKa + log [acetate]/[acetic acid]

 = 4.76 + log (0.2/0.1)

 = 4.76 + 0.30

 = 5.1.

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