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A buffer solution contains 0.20 mole of ...

A buffer solution contains `0.20` mole of `NH _(4)` OH and `0.25` mole of `NH _(4) Cl` per litre. Calculate the pH of the solution . Dissociation constant of `NH _(4) OH at 29^(@) C ` is `1.81 xx 10 ^(-5).`

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Here, `pK_(b) = -log K_(b) = -log(1.81 xx 10^(-5)) = 4.7423`
`pOH = pK_(b) + log"" (["Salt"])/(["Base"]) rArr pOH = 4.7423 + log""(0.25)/(0.20) = 4.839`
`pH = 14 - 4.839 = 9.161`
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