Question

How do you calculate the pH of an acid?

Answer 1

In fact you measure the `pH` of an acid..........

Explanation:

`pH=-log_10[H_3O^+]`.

For strong acids, i.e. `HX (X=Cl, Br, I), HClO_4`, `H_2SO_4`, the following equilibrium lies strongly to the right.........

`HX(aq) + H_2O(l) rightleftharpoons H_3O^+ +X^-`

If, say, `0.1*mol*L^-1` monoacid is used, the solution is stoichiometric in `H_3O^+`.

`pH=-log_10(0.1)=-log_10(10^-1)=1`.