CAIE IGCSE Chemistry 7.3.4 Preparation of Insoluble Salts By Questions
Work through real CAIE IGCSE Chemistry questions to choose precipitation reactants and obtain a pure insoluble salt sample.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- choose two aqueous solutions that form the required insoluble salt by precipitation
- write or interpret ionic and state-symbol equations for insoluble salt formation
- obtain a pure insoluble salt by filtration, washing and drying
- identify the correct order of precipitation, filtration, washing and drying
CAIE IGCSE Chemistry 7.3.4 Preparation of Insoluble Salts By Questions question 1
[Maximum number: 4]
Question (a)
(a)
Lead(II) bromide, PbBr2, is an insoluble salt and is made by precipitation.
Question (i)
(i)
Name two aqueous solutions that produce a precipitate of lead(II) bromide when they are mixed.
1
2
M1 lead(II) nitrate(1)
M2 sodium bromide / potassium bromide / ammonium bromide(1)
Question (ii)
(ii)
Describe how to produce a pure sample of lead(II) bromide from the mixture of aqueous solutions in (a)(i).
M1 filter precipitate or lead(II) bromide or solid or residue(1)
M2 wash the residue with distilled water AND dry e.g. between filter papers(1)
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