Indigestion is caused by excess hydrochloric acid in the stomach. Antacid tablets contain bases that neutralise some of this acid.
Brand P contains magnesium hydroxide, Mg(OH)2\mathrm{Mg(OH)_{2}}Mg(OH)2. Brand Q contains calcium carbonate, CaCO3\mathrm{CaCO_{3}}CaCO3.
Write the ionic equation for neutralisation. Include state symbols.
Write the balanced equation for the reaction between magnesium hydroxide and hydrochloric acid.
One tablet of brand P contains 0.290 g of magnesium hydroxide. Calculate the volume, in cm3\mathrm{cm^{3}}cm3, of 0.100 mol dm−3\mathrm{mol\,dm^{-3}}moldm−3 hydrochloric acid that one tablet can neutralise. Relative formula mass: Mg(OH)2=58\mathrm{Mg(OH)_{2}} = 58Mg(OH)2=58
Suggest one disadvantage of using brand Q rather than brand P.
Calcium carbonate reacts with hydrochloric acid in a 1:2 1:2\,1:2 ratio. Relative formula mass: CaCO3=100\mathrm{CaCO_{3}} = 100CaCO3=100. Determine which base neutralises more hydrochloric acid per gram. Show your working.
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.