Barium sulfate is used in "barium meals" because it shows up on X-rays. It is safe to swallow because it is insoluble. Soluble barium compounds are toxic.
A technician makes barium sulfate by mixing barium chloride solution with sodium sulfate solution.
The technician also needs to make calcium carbonate. The technician has these solutions: calcium nitrate, potassium sulfate, sodium carbonate and sodium nitrate.
Choose two solutions that could be mixed to make calcium carbonate. Explain your choice using the solubility rules.
Write the ionic equation for the formation of barium sulfate. Include state symbols.
The technician mixes 50.0 cm3\mathrm{cm^{3}}cm3 of 0.200 mol dm−3\mathrm{mol\,dm^{-3}}moldm−3 barium chloride solution with 40.0 cm3\mathrm{cm^{3}}cm3 of 0.300 mol dm−3\mathrm{mol\,dm^{-3}}moldm−3 sodium sulfate solution: BaCl2(aq)+Na2SO4(aq)→BaSO4(s)+2NaCl(aq)\mathrm{BaCl_{2}(aq)} + \mathrm{Na_{2}SO_{4}(aq)} \rightarrow \mathrm{BaSO_{4}(s)} + 2\mathrm{NaCl(aq)}BaCl2(aq)+Na2SO4(aq)→BaSO4(s)+2NaCl(aq)
Calculate the maximum mass of barium sulfate that can form. Relative formula mass: BaSO4=233\mathrm{BaSO_{4}} = 233BaSO4=233
Devise a method to prepare a pure, dry sample of barium sulfate from barium chloride solution and sodium sulfate solution.
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.