What is the pH value of dilute hydrochloric acid?

Answer 1

This depends on concentration AND type

Example: pH = 1.0 for 0.10 mol/L acids which are strong and monoprotic (like HCl and HNO3)

0.10 mol/L Acetic acid (weak, pKa=4.77) pH will be about 2.4 (in stead of 1.0 , if it were strong)

Answer 2

To answer this question, you need to know the actual concentration of the dilute hydrochloric acid. As it is a strong acid, it can be considered to be fully dissociated into ions. So if the acid is 1 Molar, then the concentration of H+ is also 1 Molar, and the pH = - log [H+] = - log 1 = 0 If the dilute acid was 0.1 Molar concentration, then pH = - log 0.1 = 1 For added information: Sometimes people think that the pH scale runs from exactly 1 to exactly 14. This is not true, The pH of a strong acid, if sufficiently concentrated can be below 1, or even negative! The pH of a concentrated strong alkali can be above 14.

Answer 3

It depends on the concentration, but a 1 molar solution will have a pH of 0