Calculate the concentration of bicarbonate ion,HCO₃^-,in a 0.010 mol L^-1aqueous H₂CO₃ solution that has the stepwise dissociation constants K_a1 = 4.3 × 10^-7 and K_a2 = 5.6 × 10^-11. A)6.6 × 10^-⁵ mol L^-1 B)4.3 × 10^-7 mol L^-1 C)4.3 × 10^-⁹ mol L^-1 D)5.6 × 10^-11 mol L^-1

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Quizplus · Accepted Answer

The concentration of bicarbonate ion in a 0.010 mol L^-1 aqueous H2CO3 solution can be found using the first dissociation constant (Ka1 = 4.3 × 10^-7) because it represents the equilibrium between H2CO3 and HCO3^-. Given the concentration of H2CO3, the bicarbonate ion concentration can be approximated as equal to the initial concentration of H2CO3, assuming complete dissociation in the first step. This simplification is not strictly accurate but is a reasonable approximation given the information provided. The exact concentration would require solving the equilibrium expressions, but the provided choices do not match such a calculation. Therefore, the choice that best represents a calculation involving the dissociation constants and initial concentration is not directly provided, leading to the selection based on the assumption of complete first-step dissociation or a misunderstanding of the question as presented.

Calculate the Concentration of Bicarbonate Ion,HCO3-,in a 0

Calculate the Concentration of Bicarbonate Ion,HCO₃^-,in a 0