1.

Ammonium cyanide is a salt of NH_(4)OH(K_(b)=1.8xx10^(-5)) and HCN (K_(a)=4.0xx10^(-10)). The hydrolysis constant of 0.1 M NH_(4)CN at 25^(@)C is :

Answer»

`1.4`
`7.2xx10^(-15)`
`7.2xx10^(-1)`
`1.4xx10^(-6)`

SOLUTION :`K_(H)=(K_(w))/(K_(a)xx K_(b))`
`=(1xx10^(-14))/(4.0xx10^(-10)xx1.8xx10^(-5))=1.4`


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