The pH of a solution containing \( 0.4 \mathrm{M} \mathrm{HCO}_{3}^{-} \)and \( 0.2 \mathrm{MCO}...

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The pH of a solution containing \( 0.4 \mathrm{M} \mathrm{HCO}_{3}^{-} \)and \( 0.2 \mathrm{MCO}_{3}^{2-} \) is :
\[
\left[K_{a_{1}}\left(\mathrm{H}_{2} \mathrm{CO}_{3}\right)=4 \times 10^{-7} ; K_{a_{2}}\left(\mathrm{HCO}_{3}^{-}\right)=4 \times 10^{-11}\right]
\]
(a) \( 10.4 \)
(b) \( 10.1 \)
(c) \( 6.1 \)
(d) \( 10.7 \)
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