1.

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

Answer»

6.5
4.8
3.8
8.6

Solution :`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`


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