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Question

Given the Ka for acetic acid is 1.77×105 and Kb for ammonium hydroxide is 1.82×105.
Calculate the pH of an aqueous solution of ammonium acetate (CH3COONH4) at 25C.

A
8.115
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B
7.01
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C
7.65
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D
8.05
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Solution

The correct option is B 7.01
pKa=log(Ka)pKa=log(1.77×105)=(50.25)pKa=4.75

pKb=log(Kb)pKb=log(1.82×105)=(50.26)pKb=4.74

For a salt of weak acid and weak base pH is given as:
pH=7+12(pKapKb)pH=7+12(4.754.74)pH=7+0.012pH=7.005

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