Question

What is the pH of a .025 M `HCl` solution?

Answer 1

The pH is 1.60.

Explanation:

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

For a 0.025 M HCl solution the concentration of the hydrogen ions, `["H"^+]`, is 0.025 moles/liter (i.e. 0.025 M).

pH is defined as `-log ["H"^+]`.

Substituting 0.025 into the equation for pH we find that the 0.025 M HCl solution has a pH of -log(0.025) = 1.60.