For the diprotic weak acid H₂A, Kₐ₁ = 3.1 x 10⁻⁶ and Kₐ₂ = 5.1 x 10⁻⁹.
What is the pH of a 0.0500 M solution of H₂A?
What are the equilibrium concentrations of H₂A and A²⁻ in this solution?

pH = ?

H₂A = ?

A²⁻ = ?