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A buffer solution is made by mixing a we...

A buffer solution is made by mixing a weak acid HA `(K_(a) =10^(-6))` with its salt NaA in equal amounts. What should be amount of acid or salt that should be added to make 90 mL of buffer solution in which if 0.1 mole of strong acid are added into 1 L of this buffer solution then change in pH is unity ?

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