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Question

What volume of 0.1 M sodium formate solution should be added to 50 mL of 0.05 M formic acid to produce a buffer solution of pH=4.0?
(pKa of formic acid =3.80)
(antilog 1.59 =39.62)

A
3.96 mL
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B
39.6 mL
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C
45 mL
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D
35.6 mL
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