1.

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)

Answer»

4.9
`5.0`
`7.0`
`10.0`

Solution :Hydrolysis of a salt of weak acid and weak base
`PH = 7 + (1)/(2)(pK_(a) -pK_(B)) = 7`
as `pK_(a) ~~ pK_(b)`.


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