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Acids

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Question 48

A student uses the following method to prepare a pure, dry specimen of the insoluble salt, lead(II) iodide (PbI2PbI_2PbI2​):

  • Measure 40 cm3 of lead(II) nitrate solution into a beaker.
  • Add a few drops of potassium iodide solution until a bright yellow precipitate is observed.
  • Allow the yellow precipitate to settle to the bottom of the beaker.
  • Carefully pour off (decant) the liquid from the top of the beaker.
  • Use a spatula to scrape the wet yellow solid directly onto a piece of paper to dry in the air.

Explain two improvements that should be made to this method to increase both the amount (yield) and the purity of the lead(II) iodide obtained.

[8]

Acids Questions

  1. GCSE
  2. /Chemistry
  3. /Acids

Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 276 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank