A student adds excess magnesium ribbon to 50 cm3\mathrm{cm^{3}}cm3 of 0.10 mol dm−3\mathrm{mol\,dm^{-3}}moldm−3 hydrochloric acid. She repeats the experiment with 50 cm3\mathrm{cm^{3}}cm3 of 0.10 mol dm−3\mathrm{mol\,dm^{-3}}moldm−3 ethanoic acid. Hydrochloric acid is a strong acid and ethanoic acid is a weak acid.
Compared with hydrochloric acid, how does ethanoic acid produce hydrogen?
More slowly, and a smaller final volume, because ethanoic acid is only partly dissociated
More slowly, but the same final volume, because ethanoic acid is more dilute
At the same rate, and the same final volume, because the acid concentrations are equal
More slowly, but the same final volume, because ethanoic acid is only partly dissociated
44 exam-style questions on Edexcel GCSE Chemistry 4.1 Acids, covering 4.1.1 Acids, alkalis and the pH scale, 4.1.2 Hydrogen ion concentration and pH, 4.1.3 Dilute and concentrated, weak and strong acids, 4.1.4 Bases, alkalis and the reactions of acids, 4.1.5 Chemical tests for hydrogen and carbon dioxide, 4.1.6 Neutralisation as a reaction of acids with bases, 4.1.7 Preparing soluble salts, and 4.1.8 Solubility rules and preparing insoluble salts. Each one has a worked solution and a mark scheme showing where the marks go.