What is the concentration of Ba(OH)2(aq)\text{Ba(OH)}_2(\text{aq})Ba(OH)2(aq), in mol dm−3\text{mol dm}^{-3}mol dm−3, that has pH=13.30\text{pH} = 13.30pH=13.30 at 25 ∘C25\ ^\circ\text{C}25 ∘C?
(Kw=1.00×10−14mol2dm−6K_{\text{w}} = 1.00 \times 10^{-14} \text{mol}^2 \text{dm}^{-6}Kw=1.00×10−14mol2dm−6 at 25 ∘C25\ ^\circ\text{C}25 ∘C)
5.01×10−145.01 \times 10^{-14}5.01×10−14
0.1000.1000.100
0.2000.2000.200
0.4000.4000.400
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.