The pKb of dimethylamine and pKa of acet...

The `pK_b` of dimethylamine and `pK_a` of acetic acid are 3.27 and 4.77 respectively at T(K). The correct option for the pH of dimethyammonium acetate solution is:

A

`5.50`

B

`7.75`

C

`6.25`

D

`8.50`

Verified by Experts

The correct Answer is:

B

Dimethylammonium acetate is a weak acid and weak base type of salt
`pH = 7 + 1/2 pK_(a) - 1/2 pK_(b)`
`= 7 + 1/2 xx 4.77 - 1/2 xx 3.27 `
`= 7.75 ` .

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