To prepare sulphur dioxide gas in the laboratory Std 8 to 12 Science practical.

Preparation of Sulphur Dioxide in Laboratory

To prepare sulphur dioxide gas in the laboratory. 

AIM :  To prepare sulphur dioxide gas in the laboratory and study its properties.

It is known from the properties of sulphur dioxide that it is extremely pungent smelling colourless bacteriostatic gas. Excess of sulphur dioxide in the air causes air pollution. When it escapes from engine exhaust and factory  chimneys it causes pollution. It is suffocating and leads respiratory inflammation. For this reason it is necessary to reduce  its proportion from the air.

THEORY :  Copper metal and concentrated sulphuric acid reacts to give corresponding  acid salt ( copper sulphate ) and sulphur dioxide gas.

APPARATUS  : Round bottom flask, thistle funnel, delivery tube, four to five gas jars, stand, two-holed cork, lid, wire gauze, tripod stand, etc.

CHEMICALS  : Copper metal, Sulphuric acid, red and blue litmus papers, wax, potassium permanganate, magnesium strip etc.

Preparation of Sulphur dioxide in Laboratory

Observation :- 

Physical properties :

1. Colour of sulphur dioxide gas :
2.  Odour or small of sulphur dioxide gas:
3.  Solubility of the gas in water :
4.  During the experiment this gas is collected by the upward displacement of air, therefore this gas is                    than air.

Chemical properties :

1. When red and blue litmus papers are inserted in gas jar containing sulphur dioxide.
2.  When an ignited magnesium ribbon is held in a gas jar containing sulphur dioxide.
3.  When potassium permanganate solution is added to the gas jar containing sulphur dioxide.
4.  Give the chemical reaction, which is used to prepare sulphur dioxide in laboratory.

CONCLUSION :-

PRACTICAL USES

It is known from the properties of sulphur dioxide that it is extremely pungent smelling colourless bacteriostatic gas. Excess of sulphur dioxide in the air causes air pollution. When it escapes from engine exhaust and factory  chimneys it causes pollution. It is suffocating and leads respiratory inflammation. For this reason it is necessary to reduce  its proportion from the air.

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To prepare sulphur dioxide gas in the laboratory.