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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

Text Solution

Verified by Experts

We know, `K_b(x^(-))=10^(-10)`
Also for conjugate acid -base pair
`K_(aHx) xx K_(b(X^(-1))=10^(-14)`
`K_(a(HX)) xx 10^(-4)`
Now `[HX]=[X^(-)]`
`therefore pH =-log K_a+log (["Salt"))/(["Acid"])`
`=-log 10^(-4)`
pH =4
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