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)