Answer to Question #344155 in General Chemistry for Meg

Question

What is the pH of a 0.57 M solution of HCl, a strong acid? Show your work.

Answer 1

1. The dissociation reaction of HCl :

HCl <=> H⁺ + Cl^-

2. Hydrochloric acid is a strong acid that completely dissociates in water.

For a 0,57 M HCl solution the concentration of the hydrogen ions, [H⁺]

, is 0.57 moles/liter (i.e. 0.57 M).

3. pH of solution: It is defined as negative of logarithm of hydrogen ion concentration. Mathematically:- pH = - log[H⁺] .

Substituting 0.57 into the equation for pH we find that the 0.57 M HCl solution has a pH of -log(0.57) = 0,244.

ANSWER: pH = 0,244