Answer to Question #308161 in General Chemistry for Sofia

Question

For the diprotic weak acid H₂A, 𝐾a1=3.6×10^−6 and 𝐾a2=6.2×10^−9

What is the pH of a 0.0700 M solution of H2A? 

pH=

What are the equilibrium concentrations of H2A and A2− in this solution?

[H2A]=

[A^2−]=

Answer 1

pH = 2.91

H2A = 0.0446M

A^2- = 9.00×10^-9