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Edexcel IGCSE Chemistry 2.41C Preparing a Pure, Dry Insoluble Salt

Edexcel IGCSE Chemistry 2.41C Preparing a Pure, Dry Insoluble Salt
Edexcel IGCSE Chemistry syllabusChemistry 4CH1First assessment 2019

Practise preparing an insoluble salt by precipitation, then separating, washing and drying the solid product.

How this is tested

  • dissolve or mix suitable soluble reactants to form the required precipitate
  • filter the precipitate and wash it with distilled water to remove soluble impurities
  • dry the washed solid between filter papers or in a suitably warm place

Question 6(a)

[Maximum number: 3]

A scientist reacts lead(II) nitrate solution with sodium bromide solution.

This is the equation for the reaction.

Pb(NO3)2(aq)+2NaBr(aq)→PbBr2( s)+2NaNO3(aq)\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{aq})+2 \mathrm{NaBr}(\mathrm{aq}) \rightarrow \mathrm{PbBr}_{2}(\mathrm{~s})+2 \mathrm{NaNO}_{3}(\mathrm{aq})

Describe how the scientist could obtain a pure dry sample of lead(II) bromide (PbBr2)\left(\mathrm{PbBr}_{2}\right) from the reaction mixture.