What is the [H₂AsO₄^-] for a solution labeled 0.10 M arsenic acid (H₃AsO₄)? [Ka1 = 6 × 10^-3, Ka2 = 1 × 10^-7, Ka3 = 3 × 10^-12] A) 1 × 10^-7 B) 6 × 10^-3 C) 0.02 D) 0.08 E) 6 × 10^-10

Question

Quizplus · Accepted Answer

The concentration of H2AsO4- can be approximated using the first dissociation constant (Ka1) since it is much larger than Ka2 and Ka3. The concentration is calculated as [H2AsO4-] ≈ √(Ka1 × [H3AsO4]) = √(6 × 10^-3 × 0.10) = 0.024, which is closest to 0.02.

What Is the [H2AsO4-] for a Solution Labeled 0

What Is the [H₂AsO₄^-] for a Solution Labeled 0