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The expression to calculate pH of sodium...

The expression to calculate pH of sodium acetate solution at `25^(@)C` is

A

`pH = 7 + (1)/(2) pK _(b) (CH _(3) COOH) - (1)/(2)lg `[salt]

B

`pH = 7 + (1)/(2) pK _(a) (CH _(3) COOH) - (1)/(2) log` [salt]

C

`pH = 7 + (1)/(2) pK _(b) (CH _(3) COOH) + (1)/(2) log ` [salt]

D

`pH = 7 + (1)/(2) pK _(a) (CH _(3) COOH) + (1)/(2) log ` [salt]

Text Solution

Verified by Experts

The correct Answer is:
B
pH of salt of `W _(1) // S _(B)` is `pH = (1)/(2) (pK _(w) + pK _(a) + log C)`
`= (14)/(2) + (1)/(2) pK _(a)+ (1)/(2) log X = 7 + (1)/(2) pK _(a) (CH _(3) COOH) + (1)/(2) log ` [Salt]
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