K_a for arsenic acic,HAsO₄^2-,is 7.5 × 10^-12.What is the pH of a 0.15 M aqueous solution of AsO₄^3-?

Question

Quizplus · Accepted Answer

The pH of the solution can be calculated using the Kb value for AsO4^3-, which is derived from the Kw and Ka of HAsO4^2-. Kb = Kw/Ka = 1.0 × 10^-14 / 7.5 × 10^-12 = 1.33 × 10^-3. Using the formula pH = 14 - pOH, and calculating pOH from the concentration and Kb, the pH is approximately 12.10.

Ka for Arsenic Acic,HAsO42-,is 7

K_a for Arsenic Acic,HAsO₄^2-,is 7