Edexcel IGCSE Chemistry 复习笔记 2.7.9 Practical: Prepare Lead(II)Sulfate

Aim:

To prepare a dry sample of lead(II) sulfate

Diagram:

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 sulfateEquation for the reaction:

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

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