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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.

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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

This question was posed to me in my homework.

The query is from Buffering against pH changes in Biological Systems topic in section Water Basics of Biochemistry

1 Answer

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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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