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A salt is formed when a weak acid of dis...

A salt is formed when a weak acid of dissociation constant `10^(-4)` and weak base of dissociation constant `10^(-5)` are mixed. The pH and degree of hydrolysis of salt solution are

A

5,1%

B

7,12%

C

6.5,0.3%

D

0.3,6.5 %

Text Solution

Verified by Experts

The correct Answer is:
3
`K_(a)=10^(-4) , pK_(a) =4`
`k_(b)=10^(-5) , pK_(b)=5`
`h=sqrt(K_(h))`
`=sqrt(K_(h))/(K_(a)xxK_(b))`
`=sqrt(10^(-14))/(10^(-5)xx10^(-5))=sqrt(10xx10^(-6))`
`=3xx10^(-3)`
`% "Hydrolysis" = h xx100 =0.3 %`
`pH=7+(1)/(2)pK_(a)-(1)/(2)pk_(b)=6.5`
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