Practical: Prepare Lead(II) Sulfate (Edexcel IGCSE Chemistry (Modular))
Revision Note
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
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 precipitate from mixture
Wash 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 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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