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. 

To prepare ammonia gas in the laboratory and study its properties GSEB std 8 to 12

Prepare Ammonia Gas

To prepare ammonia gas in the laboratory 









AIM :  To prepare ammonia gas in the laboratory and study its properties

THEORY :  On heating a mixture of ammonium chloride and calcium hydroxide, we get ammonium gas.

APPARATUS   :  Big hard glass tube, delivery tube, hollow glass tube, Bunsen burner, glass rod, two single-holed rubber cork, four to five gas jar with lids, stand and one CaO bottle as shown in the figure.

CHEMICALS : Calcium hydroxide, ammonium chloride, concentrated hydrochloric acid, red and blue litmus papers.

Preparation of Ammonia gas

Prepare Ammonia Gas In Laboratory (step-1)

Prepare Ammonia Gas In Laboratory (step-2)

Prepare Ammonia Gas In Laboratory (step-3)

Prepare Ammonia Gas In Laboratory (step-4)

Prepare Ammonia Gas In Laboratory (step-5)

Prepare Ammonia Gas In Laboratory (step-6)

Observation :

i. Colour of ammonia gas :

ii. Odour or smell of ammonia gas :

iii. Ammonia gas is collected by downhard displacement of air therefore it is than air.

iv. Use moist  red and blue litmus papers and check the effect on ammonia gas and conclude :

         Wet red litmus : 

Wet blue litmus : 

 Conclusion :

 What happens when a glass rod is dipped in concentrated HCL is brought near the mouth of gas jar containing ammonia ?

CONCLUSION

PRACTICAL USES

Ammonia is used in the manufacture of fertilizers, nitric acid, nylon fibers and in many organic chemicals.