First, we need to find the concentration of H⁺ ions after the first ionization. We can use the formula for Ka1:
$$Ka1 = \frac{[H^+][HCO_3^-]}{[H_2CO_3]}$$
Let x be the concentration of H⁺ ions after the first ionization. Then, we have:
$$4.3 \times 10^{-7} =
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