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Question

In a buffer solution consisting of a weak acid and its salt, the ratio of concentration of salt to acid is increased tenfold, then the pH of the solution will:

A
Increase by one
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B
Increase tenfold
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C
Decrease by one
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D
Decrease tenfold
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Solution

The correct option is A Increase by one
Using Henderson's equation,
pH=pKa+log[Salt][Acid]
According to the question, ratio of the concentration of salt to acid is increased tenfold.
Hence,
pH=pKa+log10[Salt][Acid]
pH=log10+log[Salt][Acid]+pKa
pH=1+log[Salt][Acid]+pKa
The pH of the solution will increase by 1.

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