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Q.

A solution is 0.1 M in CH3COOH and 0.1 M in CH3COON a. Which of the following will change its pH significantly?

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a

None will change the pH significantly

b

Addition of small amount of CH3COOH without change in volume

c

Addition of small amount of CH3COONa without change in volume

d

Addition of water

answer is D.

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Detailed Solution

Buffer solution is a solution that does not change its pH value when a weak acid or basic is added (less than 1%), or when the solution is diluted.
Buffer action is the process by which a buffer solution works, while buffer capacity is the ability of a solution to resist changes in pH value.
buffer solution with acid A weak acid and its salt are combined with a strong base to form an acidic buffer solution.
Here, the acid and salt concentrations in the buffer solution are the same.

pH=pKa+log[ salt ][ acid ]

pH will remain constant as long as the volume of the solution stays constant.

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