pH of polyprotic acid

Chemistry Level 2

Find the pH of 1.01.0 M NaHCO3,\text{NaHCO}_{3}, using the following acid ionization constants: Ka1=[HCO3][H3O+][H2CO3]=4.3×107Ka2=[CO32][H3O+][HCO3]=4.8×1011.\begin{aligned} K_{a1} &= \frac{[\text{HCO}_{3}^{-}][\text{H}_{3}\text{O}^{+}]}{[\text{H}_{2}\text{CO}_{3}]}= 4.3 \times 10^{-7}\\ K_{a2} &= \frac{[\text{CO}_{3}^{2-}][\text{H}_{3}\text{O}^{+}]}{[\text{HCO}_{3}^{-}]}= 4.8 \times 10^{-11}. \end{aligned}

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