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A certain buffer solution contains equal...

A certain buffer solution contains equal concentartion of `X^(Theta)` and `HX`. The `K_(b)` for `X^(Theta)` is `10^(-10)`. The `pH` of the buffer is

A

`4`

B

`7`

C

`10`

D

`14`

Text Solution

Verified by Experts

The correct Answer is:
A
`K_(a) xx K_(b) = 10^(-14)` for a pair of cojugate acid base
`K_(b) for X^(Theta) = 10^(-10)`
`K_(a) for HX = 10^(-4), pK_(a) = 4`
`pH = pK_(a) + "log" ([X^(Theta)])/([HX])`
`= pK_(a) = 4`.
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