What is the pH of an aqueous solution labeled "0.10 M phosphoric acid"?
[K_a1 = 7.1 × 10^-3;K_a2 = 6.3 × 10^-8;K_a3 = 4.2 × 10^-13]

Question

What is the pH of an aqueous solution labeled "0.10 M phosphoric acid"? [K_a1 = 7.1 × 10^-3;K_a2 = 6.3 × 10^-8;K_a3 = 4.2 × 10^-13] A)5.7 B)4.3 C)3.1 D)2.3 E)1.6

Quizplus · Accepted Answer

The pH is primarily determined by the first dissociation constant (Ka1) for phosphoric acid, as it is the strongest. Using the formula pH = -log[H+], where [H+] is approximately equal to the square root of (Ka1 * concentration), the pH is calculated to be around 1.6.

What Is the PH of an Aqueous Solution Labeled "0