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Calculate the pH of an aqueous solution ...

Calculate the `pH` of an aqueous solution of `1.0M` ammonium formate assuming complete dissociation. `(pK_(a)` fo atomic acid is `3.8` and `pK_(a)` of ammonia is `4.8)`.

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For salts of weak acid and weak base.
`pH = 7 + 1/2(pK_(a) - pK_(b)) = 7 + 1/2(3.8-4.8) = 6.50`
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