Carbonic acid, \( \mathrm{H}_{2} \mathrm{CO}_{3} \), is a diprotic acid for which \( \mathrm{K}_....

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Carbonic acid, \( \mathrm{H}_{2} \mathrm{CO}_{3} \), is a diprotic acid for which \( \mathrm{K}_{1}=4.2 \times 10^{-7} \) and \( \mathrm{K}_{2}=4.7 \times 10^{-11} \). Which solution
\( \mathrm{P} \)
will produce a \( \mathrm{pH} \) closest to 9 ?
(1) \( 0.1 \mathrm{M} \mathrm{H}_{2} \mathrm{CO}_{3} \)
(2) \( 0.1 \mathrm{M} \mathrm{Na}_{2} \mathrm{CO}_{3} \)
(3) \( 0.1 \mathrm{M} \mathrm{NaHCO}_{3} \)
(4) \( 0.1 \mathrm{M} \mathrm{NaHCO}_{3} \) and \( 0.1 \mathrm{M} \mathrm{Na}_{2} \mathrm{CO}_{3} \)


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