A sample of wastewater from an industrial plant contains barium hydroxide, Ba(OH)2\text{Ba(OH)}_2Ba(OH)2, at a concentration of 0.075 mol dm-3. At 310 K (the temperature of the effluent), the ionic product of water, KwK_{\text{w}}Kw, is 2.4 × 10-14 mol2 dm-6.
What is the pH of this wastewater sample at 310 K?
12.4912.4912.49
12.8012.8012.80
12.8812.8812.88
13.1813.1813.18
77 exam-style questions on AQA A Level Chemistry Acids and bases (A-level only), covering Brønsted–Lowry acid–base equilibria in aqueous solution (A-level only), Definition and determination of pH (A-level only), The ionic product of water, $K_w$ (A-level only), Weak acids and bases $K_a$ for weak acids (A-level only), pH curves, titrations and indicators (A-level only), and Buffer action (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.