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K(a) for HA is 4.9 xx 10^(-8). After mak...

`K_(a)` for `HA` is `4.9 xx 10^(-8)`. After making the necessary approximation, calculate for its decimolar solution,
a. `%` dissociation b. `overset(Θ)OH` concentration
c. `pH`

A

`3.5`

B

`4.2`

C

`5.3`

D

`2.5`

Text Solution

Verified by Experts

The correct Answer is:
B
`p^(H) = 1/2(p^(ka) - logc)`
`= 1/2(7.3 - "log" 0.1)`
`= 1/2(8.3), = 4.15, =4.2`
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