Chemistry of Cupric Oxide

Cupric oxide is also known as black oxide of copper. It is an inorganic compound.

Preparation:

a. It is obtained by heating metallic copper in air.
$$\ce{2Cu + O2->2CuO}$$

b. It is obtained by heating the malachite, copper hydroxde and copper nitrate.
$$\ce{CuCO3.Cu(OH)2->[\Delta]2CuO + H2O + CO2}$$
$$\ce{Cu(OH)2->[\Delta]CuO + H2O}$$
$$\ce{ 2Cu(NO3)2->[\Delta]2CuO + 4NO2 + O2}$$

Physical Properties:

  • It is black colored hygroscopic powder.
  • It is insoluble in water.

Chemical properties:

a. Action with heat: Cupric oxide when heated gets decomposed to cupric oxide gives oxygen gas.
$$\ce{4CuO->[\Delta]2Cu2O + O2}$$

b. Action with hydrogen: On passing hydrogen gas, cuprous acid gets reduced to copper metal.
$$\ce{CuO + H2->Cu + H2O}$$

c. Action with Hydrochloric acid: Cupric oxide when reacted with hydrochloric acid gives cupric chloride and water.
$$\ce{CuO + 2HCl->CuCl2 + H2O}$$

d. Action with sulphuric acid: Cupric oxide upon reacting with sulphuric acid gives copper sulphate and water.
$$\ce{CuO + H2SO4->CuSO4 + H2O}$$

Uses of Cupric oxide:

  • To prepare blue colored glass.
  • In purification of petroleum.
  • To estimate carbon and hydrogen present in the organic compound.

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