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A weak acid HA has K(a) = 10^(-6). What ...

A weak acid `HA` has `K_(a) = 10^(-6)`. What would be the molar ratio of this acid and its salt with strong base so that `pH` of the buffer solution is `5`?

A

1

B

2

C

10

D

`1//10`

Text Solution

Verified by Experts

The correct Answer is:
C
`pK_(a) = 6` . Now , for an acidic buffer , `5 = 6 + log . "[Salt]"/"[Acid]" " or " "[Acid]"/"[Salt]" = 10`.
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