A student prepares sodium sulfate by titration. 25.0 cm3\mathrm{cm^{3}}cm3 of 0.200 mol dm−3\mathrm{mol\,dm^{-3}}moldm−3 sodium hydroxide solution is exactly neutralised by 0.100 mol dm−3\mathrm{mol\,dm^{-3}}moldm−3 sulfuric acid.
2NaOH+H2SO4→Na2SO4+2H2O\mathrm{2NaOH + H_{2}SO_{4} \rightarrow Na_{2}SO_{4} + 2H_{2}O}2NaOH+H2SO4→Na2SO4+2H2O
Relative formula mass: Na2SO4\mathrm{Na_{2}SO_{4}}Na2SO4 = 142
Which row gives the volume of sulfuric acid needed and the maximum mass of anhydrous sodium sulfate that can be obtained?
25.0 cm3\mathrm{cm^{3}}cm3 and 0.355 g
50.0 cm3\mathrm{cm^{3}}cm3 and 0.710 g
25.0 cm3\mathrm{cm^{3}}cm3 and 0.710 g
12.5 cm3\mathrm{cm^{3}}cm3 and 0.355 g
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.