Sunday, July 9, 2017

2.42: Practical: Prepare a Sample of Pure, Dry Hydrated Copper (II) Sulfate Crystals Starting from Copper (II) Oxide



PREPARATION OF PURE, DRY HYDRATED COPPER (II) SULFATE CRYSTALS:
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PREPARATION OF COPPER (II) SULFATE CRYSTALS
Diagram showing the Heating of Mixture to Leave a Saturated Solution

ACID = Dilute Sulfuric Acid                     INSOLUBLE BASE = Copper (II) Oxide

METHOD:

  • Add Dilute Sulfuric Acid into a beaker and heat using a bunsen burner flame
  • Add Copper (II) Oxide (insoluble base) in small amounts and stir until Copper (II) Oxide is in excess (stops disappearing)
  • Filter mixture into an evaporating basin to remove the excess Copper (II) Oxide
  • Leave filtrate in a warm place to dry and crystallize
  • Decant excess solution
  • Blot crystals dry

EQUATION OF REACTION:


Copper (II) Oxide    +    Dilute Sulfuric Acid   →    Copper (II) Sulphate   +    Water
        
          CuO (s)                             H2SO4 (aq)                             CuSO4 (s)                 H2O (l)


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