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Calculate the pH of a solution containin...

Calculate the pH of a solution containing 0.1 M `CH_(3)COOH` and 0.15 M `CH_(3)COO^(-)`.
`(K_(a) "of" CH_(3)COOH=1.8xx10^(-5))`

A

9.1

B

3.9

C

10 .

D

4 .91

Text Solution

Verified by Experts

The correct Answer is:
D
pH of acidic buffer solution is
`pH=pKa+ "log" ({"salt"})/({Acid})`
` Ka=1.8xx10^(-5)`
pKa = 5 - log 1.8
=5 - 0.25
`pH=4.75+log(0.15)/(0.1)`
`=4.75+ log 1.5`
= 4.90
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