Question

What is the molarity of hydrogen ions in a 2.7 M solution of the strong acid `HCl`?

Answer 1

You have a strong monoprotic mineral acid. `[H_3O^+]` `=` `2.7*mol*L^-1`.

Explanation:

`HCl(g) + H_2O rightleftharpoons H_3O^+ + Cl^-`

This equilibrium lies strongly to the right. Thus, the concentration of hydronium ion, `H_3O^+` `=` `2.7*mol*L^-1`.