Barium hydroxide, Ba(OH)2\text{Ba(OH)}_2Ba(OH)2, is a strong base that dissociates completely in aqueous solution:
Ba(OH)2(aq)→Ba2+(aq)+2OH−(aq) \text{Ba(OH)}_2(\text{aq}) \rightarrow \text{Ba}^{2+}(\text{aq}) + 2\text{OH}^-(\text{aq}) Ba(OH)2(aq)→Ba2+(aq)+2OH−(aq)What is the pH\text{pH}pH of a 0.015 mol dm-3 solution of barium hydroxide at 298 K? (At 298 K, Kw=1.00×10−14 mol2 dm−6K_{\text{w}} = 1.00 \times 10^{-14}\text{ mol}^2\text{ dm}^{-6}Kw=1.00×10−14 mol2 dm−6)
1.521.521.52
12.1812.1812.18
12.4812.4812.48
1.821.821.82
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.