A \( 20.0 \mathrm{~mL} \) sample of a \( 0.20 \mathrm{M} \) solution of the weak diprotic acid \...

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A \( 20.0 \mathrm{~mL} \) sample of a \( 0.20 \mathrm{M} \) solution of the weak diprotic acid \( \mathrm{H}_{2} A \) is titrated with \( 0.250 \mathrm{M} \) \( \mathrm{NaOH} \). The solution of the second equivalent point is :
(a) \( 0.10 \mathrm{MaH} A \)
(b) \( 0.153 \mathrm{M} \mathrm{Na} \mathrm{Na}_{2} \mathrm{~A} \)
(c) \( 0.10 \mathrm{M} \mathrm{Na} \mathrm{Na}_{2} \mathrm{~A} \)
(d) \( 0.0769 M \mathrm{Na}_{2} A \)
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