At 37 ∘C37\text{ }^\circ\text{C}37 ∘C (physiological temperature), the ionic product of water, Kw=2.40×10−14 mol2 dm−6K_w = 2.40 \times 10^{-14} \text{ mol}^2 \text{ dm}^{-6}Kw=2.40×10−14 mol2 dm−6.
Give the expression for KwK_wKw.
Calculate the pH of pure water at 37 ∘C37\text{ }^\circ\text{C}37 ∘C. Give your answer to 2 decimal places.
35.0 cm335.0\text{ cm}^335.0 cm3 of 0.150 mol dm−30.150\text{ mol dm}^{-3}0.150 mol dm−3 aqueous barium hydroxide, Ba(OH)2\text{Ba(OH)}_2Ba(OH)2, are mixed with 45.0 cm345.0\text{ cm}^345.0 cm3 of a 0.200 mol dm−30.200\text{ mol dm}^{-3}0.200 mol dm−3 solution of hydrochloric acid. The temperature of the solution formed is maintained at 37 ∘C37\text{ }^\circ\text{C}37 ∘C.
Calculate the pH of the solution formed. Give your answer to 2 decimal places.
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.