A 010-Mol Sample of a Diprotic Acid, H₂A, Is Dissolved in in 250

Multiple Choice

A 0.10-mol sample of a diprotic acid, H₂A, is dissolved in 250 mL of water. K_a1 for this acid is 1.0 × 10^-5 and K_a2 is 1.0 × 10^-10. Calculate the concentration of A^2- in this solution.

A) 2.0 × 10^-3 M
B) 4.0 × 10^-6 M
C) 0.40 M
D) 1.0 × 10^-10 M
E) 1.0 × 10^-5 M