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4.1 Acids

4.1 Acids

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Question 32

A student prepares a sample of the insoluble salt, barium sulfate, using the following method:

  • Pour 50 cm3^{3}3 of barium chloride solution into a beaker.
  • Add potassium sulfate solution dropwise until a white precipitate is first seen.
  • Let the precipitate settle to the bottom of the beaker.
  • Carefully pour off (decant) the liquid from the top.
  • Use a spatula to scrape the wet solid barium sulfate onto a piece of paper to air dry.

Explain two improvements to this experimental method to increase the yield (amount) and purity (quality) of the barium sulfate obtained from the same starting volume of barium chloride.

[6]
Markscheme

4.1 Acids Questions

  1. GCSE
  2. /Chemistry
  3. /4.1 Acids

276 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.

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