Cuprous Oxide or Red Oxide of Cupper (Cu2O)

    It occurs in nature as cuprite. It is obtained by heating copper in air above 11000c.

    4Cu+o2  above 11000c →   2Cu2o.

     

    If can also be obtained by reducing alkaline Cuso4. (fehling’s solutional with reducing  agents like glucose.

     



    CuSO4+2NaOH      →     Cu(OH)2+Na2SO4

    Cu(OH)2       →       CuO+H2O

    2CuO + C6H12O6        →     Cu2O + C6H12O7

    Glucose                                      gluconic acid

     

    Properties

     

    • It is a red amorphous solid insoluble in water.
    • It dissolves in conc. HCl giving cuprous chloride.

    Cu2O + 2Conc.HCl       →         Cu2Cl2 + H2O

    • It dissolves in conc. H2SO4 giving copper sulphate and metallic copper

    Cu2O + H2OSO4            →    CuSO4 + H2O + Cu

    Uses

     

    • It is used in making ruby-red glass.
    • It is used in making anti-rust paints.
    • It is used in preparation of Cu2Cl2.