1.

A certain buffer solution contains equal concentration of X^(-) and HX. K_(b) for X^(-) is 10^(-10). Calculate pH of buffer

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Solution :Given that
`becauseK_(b(X^(-)) = 10^(-10)` and for conjugate acid-base pair
`K_(a(HX)) XX K_(b(X^(-))) = 10^(-14) RARR K_(a(HX)) = 10^(-4)`
But `underset("(acid) = (salt)")([HX]=[X^(-)])`
Now USING Handerson's equation
`:. pH = -log K_(a) + log.(["Salt"])/(["Acid"]) rArr pH = -log 10^(-4) = 4`


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