What is the pH for a solution labeled "0.10 M arsenic acid (H₃AsO₄) "?
[K_a1 = 6 × 10^-3,K_a2 = 1 × 10^-7,K_a3 = 3 × 10^-12]

Question

What is the pH for a solution labeled "0.10 M arsenic acid (H₃AsO₄)"? [K_a1 = 6 × 10^-3,K_a2 = 1 × 10^-7,K_a3 = 3 × 10^-12]

Quizplus · Accepted Answer

The pH is primarily determined by the first dissociation constant (Ka1) for a polyprotic acid like arsenic acid. Using the formula pH = -log[H+], where [H+] is approximately equal to the square root of (Ka1 × concentration), we find pH ≈ 1.6.

What Is the PH for a Solution Labeled "0