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A 50.0 mL sample of a 1.00 M solution of...

A 50.0 mL sample of a 1.00 M solution of a diprotic acid `H_(2)A(K_(a1)=1.0xx10^(-6) " and " K_(a2)=1.0xx10^(-10))` is titrated with 2.00 M NaOH. What is the minimum volume of 2.00 M NaOH needed to reach a pH of 10.00 ?

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