Cupric oxide is an inorganic chemical compound composed of cuprous ion and oxide ion. Cupric cuprous are the two forms of copper ions. Copper exists in two types of oxide, the one is with a higher oxidation state and another one is with a lower oxidation state, cupric oxide and cuprous oxide respectively.
The oxides of copper are of two types:
Cupric oxide- It is also known as copper cupric oxide. The oxidation state of copper in this compound is +2. +2 is the highest oxidation state of copper. Generally, in short, you can write it as oxide cupric. It exists in the monoclinic crystal system.
Cuprous oxide- the oxidation state of copper in this compound is +1. +1 is the intermediate oxidation state of copper. It can easily get oxidised or reduced.
The oxides of cupric cuprous are represented as CuO and Cu2O respectively.
Cupric Oxide can be prepared by the following methods:
It can be produced by the thermal decomposition of the cupric carbonate.
CuCO3 → CuO + CO2
Another method of Cupric oxide preparation is heating copper in the presence of air at a high temperature (around 300-800 degrees celsius).
Cu + O2 → CuO
Heating Copper Nitrate- The nitrate of copper is thermally unstable. On heating copper nitrate at a temperature around 180 degrees celsius.
2Cu (NO3)2 → 2 CuO + O2 + 4 NO2 (this reaction takes place at a temperature around 180 degrees celsius)
Heating Cupric Hydroxide- cupric hydroxide is a thermally unstable compound. It gets easily decomposed into cupric oxide on heating.
Cu(OH)2 → CuO + H2O
Cupric oxide is a black colour compound.
Cupric oxide exists in powder (amorphous) form.
The melting point of cupric oxide is 1326 degrees celsius.
Cupric oxide is insoluble in water.
Cupric oxide is soluble in ammonium chloride and potassium cyanide.
CuO + HNO3 → Cu (NO3)2 + H2O
CuO + 2HCl → CuCl2 + H2O
CuO + H2SO4 → CuSO4 + H2O
Cupric oxide reacts with the concentrated base and forms salt.
2KOH + CuO + H2O → K2 [Cu (OH)4]
Cupric oxide reacts with hydrogen and gets reduced to copper.
CuO + H2 → Cu + H2O
Cupric oxide reacts with carbon monoxide and forms elemental copper and carbon dioxide.
CuO + CO → Cu + CO2
Cupric oxide reacts with carbon and forms the elemental form of copper.
2CuO + C → 2Cu + CO2
Cupric oxide is used as a pigmenting agent in ceramic compounds. It gives blue, red, green, grey, pink, and black glazes.
Cupric oxide is widely used in laboratories for the preparation of various copper salts.
Cupric oxide is used in the manufacture of wood preservatives.
Cupric oxide is used in the welding process.
Cupric oxide is used in the manufacture of lithium batteries.
Paramelaconite is a copper mineral. In this mineral, copper exists in both +1 and +2 oxidation state.
Copper is an essential element for the human body.
Copper is used in alloy formation.
The blood of octopus contains copper as an oxygen carrier. Therefore, the colour of the blood in them is blue.
Copper is an essential trace mineral.
Copper is used as a supplement with iron for the anaemic person.
Question: Write the Physical Properties of Copper Oxide or Cupric Oxide.
Answer: The physical properties of copper oxide or cupric oxide are given below:
Cupric oxide is a dark black coloured chemical compound.
It exists in an amorphous form.
Its melting point is 1326 degrees celsius.
Cupric oxide is sparingly soluble in water.
Cupric oxide is highly soluble in ammonium chloride (NH₄Cl) and potassium cyanide (KCN)
Question: What is the Preparation Reaction of the Cupric Oxide?
Answer: Preparation reactions of cupric oxide is given below:
CuCO₃ → CuO + CO₂
Cu + O₂ → CuO
2Cu (NO₃)₂ → 2 CuO + O₂ + 4 NO₂
Cu(OH)₂ → CuO + H₂O