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What is the pH of m//20 KNC(8)H(4)O(4) s...

What is the `pH` of `m//20 KNC_(8)H_(4)O_(4)` solution .Given :`H_(2)C_(8)O_(4)` is a diabasic acid with `pK_(a_(1))& pK_(a_(2))` as `2.94 & 5.44` respectively.

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`NaNO_(3)" "[C]=0.1M`
`pH=(pK_(a_(1))+pK_(a_(2)))/(2)=(2.94+5.44)/(2)=4.19`
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