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.