Home | | Chemistry | | Chemistry | Copper Sulphate or Blue vitriol: Preparation, Properties and Uses

Chapter: 11th 12th std standard Class Organic Inorganic Physical Chemistry Higher secondary school College Notes

| Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail |

Copper Sulphate or Blue vitriol: Preparation, Properties and Uses

In laboratory it is prepared by dissolving cupric oxide (or) cupric hydroxide (or) cupric carbonate in dilute H2SO4

Copper Sulphate (CuSO4.5H2O); Blue vitriol

Preparation

In laboratory it is prepared by dissolving cupric oxide (or) cupric hydroxide (or) cupric carbonate in dilute H2SO4

CuO + H2SO4 CuSO4 + H2O

Cu(OH)2 + H2SO4  CuSO4 + 2H2O

CuCO3 + H2SO4          CuSO4 + H2O + CO2

Properties

Physical properties

1.    The anhydrous salt is colourless but the hydrated salt is blue in colour.

2.    It readily dissolves in water but is insoluble in alcohol.

Chemical Properties

1.    Action of Heat

On heating CuSO4.5H2O loses its water of crystallization and decomposes at 720 o C to give cupric oxide and sulphur trioxide.

2.        Action of ammonia

Copper sulphate gives deep blue colour with NH4OH forming complex compound.

 

CuSO4 + 4NH4OH [Cu (NH3)4]SO4 + 4H2O

3.    Action of KI

When KI is added to a solution of CuSO4, a white precipitate of cuprous iodide is produced.

 

CuSO4 + 2KI Cu I2 + K2SO4

(unstable)

 

2CuI2  Cu2I2 + I2

(white ppt)

4.    Action with KCN

A yellow precipitate of cupric cyanide is first formed with KCN and it decomposes to give cyanogen gas.

 

CuSO4 + 2KCN Cu(CN)2 + K2SO4

2Cu(CN)2  Cu2(CN)2 + (CN)2

cyanogen

5. Action of alkalies

With alkalies, a pale blue precipitate of copper hydroxide is formed.

 

CuSO4 + 2NaOH Cu(OH)2 + Na2SO4

Pale blue precipitate

6. Action with H2S

With H2S it gives a black precipitate of copper sulphide.

 

CuSO4 + H2S CuS + H2SO4 (Black ppt)

Uses

1.    It is used as a germicide and insecticide in agriculture.

2.    A mixture of copper sulphate and lime, commonly known as Bordeaux

mixture, is used as fungicide.

3. It is used in electroplating, calicoprinting and in electrical batteries.


Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail


Copyright © 2018-2020 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.