Question

The pH of a solution of HCl is 2. Find the amount of acid present in a litre of the solution.

Answer 1

Answer:

Your answer ✔︎

By DEFINITION… pH , i.e. pouvoir hydrogène , “power of hydrogen” , pH=−log10[H3O+] .

And so if pH=2 , we take REVERSE logarithms..i.e. [H3O+]=10−2∙mol∙L−1 … [H3O+]=0.010∙mol∙L−1 …,

We know that hydrochloric acid, for which the protolysis is complete, undergoes the reaction..

HCl(aq)+H2O(l)→H3O++Cl−

The solution is thus stoichiometric in hydronium ion.