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

1 Answer


The pH is 1.60.


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.