What are the concentrations of hydrogen ion and hydroxide ion in household ammonia, an aqueous solution of nh3 that has a ph of 11.50?

Answer is: the concentrations of hydrogen ion and hydroxide ion in household ammonia are 3.16·10⁻¹² M and 3.16·10⁻³ M, respectively.

pH (NH ₃) = 11.50.

pH = - log[H⁺ ].

[H⁺] = 10∧ (-pH).

[H⁺] = 10∧ (-11.5).

[H⁺] = 3.16·10⁻¹² M.

[H⁺] · [OH⁻] = 10⁻¹⁴ M².

[OH⁻] = 10⁻¹⁴ M² : 3.16·10⁻¹² M.

[OH⁻] = 0.00316 M = 3.16·10⁻³ M.