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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

Table of Contents

Structure of Copper Hydroxide – Cu(OH)2

Copper Hydroxide Structure

Chemical data on Copper Hydroxide – Cu(OH)2

Cu(OH)2 Copper Hydroxide
Density 3.37 g/cm³
Molecular Weight/ Molar Mass 97.561 g/mol
pH 7.69
Melting Point 80° C
Chemical Formula Cu(OH)2

Physical Properties of Copper Hydroxide – Cu(OH)2

Odour Fishy odour
Appearance Blue or bluish green solid
Covalently-Bonded Unit 3
Heavy Atom Count 3
Hydrogen Bond Acceptor 2
Solubility 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.

Frequently Asked Questions- FAQs

1. What is copper hydroxide used for?

Copper hydroxide used as fungicides. A mixture of copper hydroxide and copper sulfate is also used as insecticides and pesticides. Malachite copper hydroxide is a bright green mineral used as a semiprecious stone for making ornaments.

2. How is copper hydroxide formed?

Copper(II) hydroxide is formed by adding a sodium hydroxide to a dilute solution of copper(II) sulfate(CuSO4·5H2O).

3. Is copper hydroxide ionic or covalent?

Copper hydroxide(Cu(OH)2) is an ionic compound. It undergoes dissociation to produce Cu2+ cation and OH- anion. Cu is a metal and oxygen is non-metal so the bond between Cu and Oxygen is ionic in nature.

4. Is copper hydroxide a weak base?

Copper hydroxide is a hydrated copper oxide, and it does provide some concentration of OH- ions when it is in the presence of acids (H3O+). However, it is largely insoluble in water. Therefore, copper hydroxide would not be considered an alkali, but rather a weak base.

5. Is copper hydroxide a fungicide?

Copper hydroxide used as a fungicide. The compound which is used to kill parasitic fungi or their spores is known as fungicide.

Test your knowledge on Copper Hydroxide

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