Chemistry

Problem

An equilibrium mixture at 298 K was found to have a concentration of

0.250 \text{ mol dm}^{-3}

aqueous ammonia,

2.11 \times 10^{-3} \text{ mol dm}^{-3}

hydroxide ions and

2.11 \times 10^{-3} \text{ mol dm}^{-3}

ammonium ions.

\text{NH}_3(\text{aq}) + \text{H}_2\text{O}(\text{l}) \rightleftharpoons \text{NH}_4^+(\text{aq}) + \text{OH}^-(\text{aq})