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When CH(3)COONa is added to an aqueous s...

When `CH_(3)COONa` is added to an aqueous solution of `CH_(3)COOH`

A

pH value becomes zero

B

pH value remains unchanged

C

pH value decreases

D

pH value increases

Text Solution

Verified by Experts

The correct Answer is:
D
`CH_(3)COOH(aq.)hArr H^(+)(aq.)+CH_(3)COO^(-)(aq.)`
The addition of sodium acetate which provides acetate ions shift the acetic acid ionization equilibrium towards left. This results in decrease in the concenreation of hydrogen ions `(C_(H^(+)))`. So the pH value of solution increass. This phenomenon is an example of common ion effect which is defined as a shift in equilibrium on adding a substence that provides more of an ionic species already present in the dissociation equilibrium.
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