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Weak acids and bases are not completely ...

Weak acids and bases are not completely ionised when dissolved in polar medium like water
`H rarr H^(+) +A^(-)`
`{:(t_(0),C,O,O),(t_(eq),C-Calpha,Calpha,Calpha):}`
`K_(a)=(Calpha^(2))/(1-alpha)=Calpha^(2),alphasqrt((K_(a))/(C))`
`:. (alpha_(1))/(alpha_(2))=sqrt((Ka_(1))/(Ka_(2))),(alpha_(1))/(alpha_(2))=sqrt((C_(2))/(C_(1)))`
( For two acids at same conc.) (for same acid at diff conc. )
0.01M `CH_(3),COOH` is 4.24% ionised. What will be the pereentage ionisation of 0.1 `M CH_(3),COOH.`

A

`1.33%`

B

` 4.24% `

C

` 5.24% `

D

` 0.33%`

Text Solution

Verified by Experts

The correct Answer is:
A
` (alpha_1)/(alpha_2) =sqrt((C_2)/(C_1)), (4.24)/(alpha_2) = sqrt((10^(-1))/(10^(-2)))`
` (18)/(alpha_2^(2))=10 , alpha_2^(2) = 1.8 rArr alpha =sqrt(1.8) =1.34%`
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