Calculate the pH of a 0.040 M perchloric acid (HClO₄) solution.

Question

Quizplus · Accepted Answer

Perchloric acid is a strong acid, and thus it completely dissociates in water to form H+ and ClO4- ions. Therefore, the concentration of H+ ions in the solution will be equal to the concentration of the perchloric acid, which is 0.040 M. The pH is defined as the negative logarithm (base 10) of the H+ concentration, so:

pH = -log[H+]
pH = -log(0.040)
pH = 1.40

Therefore, the answer is A) 1.40.

Calculate the PH of a 0