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pH of a weakacid in 0.1 M solution is 4....

pH of a weakacid in 0.1 M solution is 4.3. Which statements are correct ?

A

`4.1`

B

` 4.8`

C

` 5.3`

D

` 7.3`

Text Solution

Verified by Experts

The correct Answer is:
B
` PH_ 1 = 4.3 rArr [H^(+) ] = 5 xx 10 ^(_5) `
`C_1 = 0.1 ,C_2 = 0.01 `
` ([H^(+) ]_1)/( [H^(+) ]_2) = sqrt((C_1)/(C_2))`
` [H^(+) ]_2 = 5 xx 10 ^(-5) xx sqrt((0. 01)/( 0.1)) = 1. 6 xx 10 ^(_5) `
`PH_2= - log 1.6 = 5- 0.2 = 4. 8 `
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