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What is the pH of a 1 M CH(3)COOH a solu...

What is the `pH` of a `1 M CH_(3)COOH` a solution `K_(a)` of acetic acid `=1.8xx10^(-5)`?
`K=10^(-14)mol^(2) litre^(-2)`

A

9.4

B

4.8

C

3.6

D

2.4

Text Solution

Verified by Experts

The correct Answer is:
A
`CH_(3)COO^(-) + H_(2)O hArr CH_(3)COOH + OH^(-)`
`:. [OH^(-)] = c xx h`
`h = sqrt((K_(w))/(K_(a)) xx C) = sqrt((10^(-14))/(1.8 xx 10^(-5)) xx 1) = 2.35 xx 10^(-5)`
`:. pOH = 4.62 , pH = 9.38 ~~ 9.4`.
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