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4.1 Acids

4.1 Acids

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Question 36

An analyst attempts to synthesize a pure, dry sample of the insoluble salt, silver chloride (AgCl\text{AgCl}AgCl), to use as a calibration standard. They use the following method:

  • Pour 40 cm340\text{ cm}^340 cm3 of silver nitrate solution into a beaker.
  • Add sodium chloride solution dropwise until a white precipitate is first observed.
  • Allow the precipitate to settle to the bottom of the beaker.
  • Carefully pour off (decant) the supernatant liquid.
  • Scrape the wet silver chloride solid onto a watch glass and leave it on a windowsill to air dry.

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

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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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