The ionic product of water, Kw=5.48×10−14 mol2 dm−6K_w = 5.48 \times 10^{-14}\text{ mol}^2\text{ dm}^{-6}Kw=5.48×10−14 mol2 dm−6 at 50 ∘C50\ ^\circ\text{C}50 ∘C.
Which is the correct expression for KwK_wKw?
Calculate the pH of pure water at 50 ∘C50\ ^\circ\text{C}50 ∘C. Give your answer to two decimal places.
Suggest why this pure water at 50 ∘C50\ ^\circ\text{C}50 ∘C is neutral.
Calculate the pH of a 0.0150 mol dm-3 solution of strontium hydroxide at 50 ∘C50\ ^\circ\text{C}50 ∘C. Give your answer to two decimal places.
The 0.0150 mol dm-3 strontium hydroxide solution at 50 ∘C50\ ^\circ\text{C}50 ∘C was a saturated solution. A student added 0.0150 mol of calcium hydroxide to 1.00 dm3 of water at 50 ∘C50\ ^\circ\text{C}50 ∘C and stirred the mixture until no more solid dissolved. Predict whether the pH of this calcium hydroxide mixture is larger than, smaller than, or the same as the pH of the strontium hydroxide solution. Explain your answer.
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.