The pH of aqueous solution of 1M `HCO ONH_(4), pK_(a)` of HCO OH is 3.8 and `pK_(b) " of " NH_(3)` is 4.8

Options

A. 6.5
B. 4.8
C. 3.8
D. 8.6

Answer

A

Explanation

`HCO ONH_(4)` is a salt of weak acid and weak base ,
`pH=1//2 pK_(w)+ 1//2 pK_(a)- 1//2pK_(b)`
`therefore pH=(1)/(2)xx14+(1)/(2)xx3.8-(1)/(2)xx4.8, pH=6.5`