Practical: Prepare Lead(II)Sulfate (Edexcel IGCSE Chemistry)

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Practical: Prepare Lead(II)Sulfate

Aim

  • To prepare a dry sample of lead(II) sulfate
  • The solid salt obtained is the precipitate, thus in order to successfully use this method the solid salt being formed must be insoluble in water, and the reactants must be soluble

Diagram

Preparation of an insoluble salt via precipitation

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

Method

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

Soluble salt 1 = lead(II) nitrate       

Soluble salt 2 = potassium sulfate

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

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

Examiner Tip

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

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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.