Calculate the concentration of bicarbonate ion, HCO₃^-, in a 0.010 mol L^-1 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 HCO₃⁻ is determined by the first dissociation step of H₂CO₃, which is governed by Kₐ₁. Using the approximation that [H⁺] ≈ [HCO₃⁻] and [H₂CO₃] ≈ 0.010 mol L⁻¹, we find [HCO₃⁻] = √(Kₐ₁ × [H₂CO₃]) = √(4.3 × 10⁻⁷ × 0.010) = 6.6 × 10⁻⁵ mol L⁻¹.

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

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