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