pH of HCI is 2.1. what is `[OH^(-)]` in its solution?

At 298 K, the pH of a solution of lemon juice is 2.32 . What are the conc. Of [H_3O^(+)] and [OH^(-) ] in this solutions?

The pH of a solution is 3. Its [OH^(-)] concentration is ................... .

An aqueous solution of HCI is 10^(-9) M HCI . The pH of the solution should be

Calculate the concentrations of H_(3)O^(+) and OH^(-) ions in the solution with the following pH values at 25^(@)C (1) pH=5.0 (2) pH=12.

What will be the pH if 0.01 mol of HCI is dissolved in the above buffer solution? Find the change in pH value.