Question

100 mL 0.1 M solutions of ammonium acetate is diluted by adding 100 mL of water. The pH of the resulting solution will be (`pK_(a)` of acetic acid is nearly equal to `pK_(a)` of `NH_(4)OH`)
A. 4.9
B. `5.0`
C. `7.0`
D. `10.0`

Answer 1

Correct Answer - C
Hydrolysis of a salt of weak acid and weak base
`pH = 7 + (1)/(2)(pK_(a) -pK_(b)) = 7`
as `pK_(a) ~~ pK_(b)`.