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Question

CH3COOH is titrated with NaOH solution. Find the ratio ([CH3COONa][CH3COOH]) when the volume of NaOH added is half that of equivalence point.

A
2.5
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B
0.5
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C
0.75
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D
1
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Solution

The correct option is D 1
CH3COOH (aq)+NaOH (aq)CH3COONa (aq)+H2O (l)
At half equivalence point, pH=pKa

Since for an acidic buffer ,

pH=pKa+log([CH3COONa][CH3COOH])
When pH=pKa
log([CH3COONa][CH3COOH])=0([CH3COONa][CH3COOH])=100=1

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