A $0.100\ \text{M}$ solution of the diprotic acid $\text{H}_2\text{A}$ ( $K_{a1}=1.0\times10^{-2},\; K_{a2}=1.0\times10^{-7}$ ) is titrated with $0.100\ \text{M}$ NaOH. Determine the pH at the first equivalence point and suggest a suitable indicator for the titration.

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pH \approx 4.5; indicator: bromocresol green

Neco 2017 Chemistry Question 19

A \(0.100\ \text{M}\) solution of the diprotic acid \(\text{H}_2\text{A}\) ( \(K_{a1}=1.0\times10^{-2},\; K_{a2}=1.0\times10^{-7}\) ) is titrated with \(0.100\ \text{M}\) NaOH. Determine the pH at the first equivalence point and suggest a suitable indicator for the titration.

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