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A mono basic weak acid solution has a mo...

A mono basic weak acid solution has a molarity of 0.005 and pH of 5. What is its percentage ionisation in this solutino ?gt

A

2

B

0.2

C

0.5

D

0.25

Text Solution

Verified by Experts

The correct Answer is:
B
`HAtoH^(+)+A^(-)`
`K_(a)=([H^(+)][A^(-)])/([HA]),:.[H^(+)]=10^(-pH)`
`:.[H^+]=10^(-5),` and at equilibrium `[H^(+)]=[A^(-)]`
`:.K_(a)=(10^(-5)xx10^(-5))/(0.0015)=2xx10^(-8)`
`alpha=sqrt((K_(a))/(C))=sqrt((2xx10^(-8))/(0.05))=sqrt(4xx10^(-6))=2xx10^(-3)`
Percentage ionization =0.2
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