Cu(OH)2 - Copper Hydroxide

What is Copper Hydroxide?

Copper hydroxide is also called cupric hydroxide is a pale blue precipitate produced when sodium or potassium hydroxide is added in excess to a solution of a copper salt. Copper hydroxide is crystalline but inert compound used in the preparation of a wide variety of salts. It is prepared by adding just sufficient aqueous ammonia to cupric sulphate to hold the copper in solution and then precipitating the hydroxide either by the addition of an equivalent quantity of alkali by removing ammonia from the solution using a dessicator.

Other names – Cuprichydroxide, Cuprous hydroxide


Copper Hydroxide


3.37 g/cm³

Molecular Weight/ Molar Mass

97.561 g/mol



Melting Point

80° C

Chemical Formula


Copper Hydroxide Structure – Cu(OH)2

Copper Hydroxide Structure

Physical Properties of Copper Hydroxide – Cu(OH)2


Fishy odour


Blue or bluish green solid

Covalently-Bonded Unit


Heavy Atom Count


Hydrogen Bond Acceptor



Insoluble in water

Chemical Properties of Copper Hydroxide – Cu(OH)2

  • Copper hydroxide reacts with sulfuric acid forms copper sulfate and water. The chemical equation is given below.
  • Cu(OH)2 + H2SO4 → CuSO4 + 2 H2O

  • Copper hydroxide reacts with nitric acid forms copper nitrate and water. The chemical equation is given below.
  • Cu(OH)2 + 2HNO3 → Cu(NO3)2 + 2H2O

Uses of Copper Hydroxide – Cu(OH)2

  • Copper hydroxide fungicides, first developed in the 1970’s, have become favored for most fungicide applications.
  • A mixture of copper hydroxide and copper sulfate is used as insecticides and pesticides.
  • Malachite copper hydroxide carbonate a bright green mineral used as an ore of copper and as a semiprecious stone for making ornaments.
  • Used as an effective biocides as wood preservatives.
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