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GCSEChemistry: Combined ScienceEdexcelRevision Notes3. Chemical changes3.1 Acids3.1.11 Preparing an Insoluble Salt

Preparing an Insoluble Salt (Edexcel GCSE Chemistry: Combined Science)

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Preparing an Insoluble Salt

Aim:

To prepare a dry sample of an insoluble salt, lead(II) sulfate

Diagram:

Preparation of lead(II)sulfate 1, downloadable IGCSE & GCSE Chemistry revision notesPreparation of lead(II)sulfate 2, downloadable IGCSE & GCSE Chemistry revision notesPreparation of lead(II)sulfate 3, downloadable IGCSE & GCSE Chemistry revision notesPreparation of lead(II)sulfate 4, downloadable IGCSE & GCSE Chemistry revision notes

The preparation of lead(II)sulfate by precipitation from two soluble salts

Method:

  • Measure out 25 cm3 of 0.5 mol dm3 lead(II) nitrate solution and add it to a small beaker
  • Measure out 25 cm3 of 0.5 mol dm3 of potassium sulfate add it to the beaker and mix together using a stirring rod
  • Filter to remove the precipitate from mixture
  • Wash the filtrate with distilled water to remove traces of other solutions
  • Leave in an oven to dry

 Soluble salt 1 = lead(II) nitrate        Soluble salt 2 = potassium sulfateEquation for the reaction: 

Pb(NO3)2  (aq) + K2SO4 (aq) → PbSO4 (s) + 2KNO3 (aq)

lead(II) nitrate + potassium sulfate → lead(II) sulfate + potassium nitrate

Examiner Tip

Care should be taken with handling lead salts as they are toxic.

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    Previous:3.1.10 Solubility RulesNext:3.2.1 Electrolysis
    Stewart

    Author: Stewart

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    Stewart has been an enthusiastic GCSE, IGCSE, A Level and IB teacher for more than 30 years in the UK as well as overseas, and has also been an examiner for IB and A Level. As a long-standing Head of Science, Stewart brings a wealth of experience to creating Exam Questions and revision materials for Save My Exams. Stewart specialises in Chemistry, but has also taught Physics and Environmental Systems and Societies.