Gases

Laboratory Preparation of Carbon Dioxide Gas

When Calcium Carbonate is treated with dilute Hydrochloric Acid, Carbon Dioxide gas is produced.

Testing of Carbon Dioxide Gas

The produced carbon dioxide gas is not visible to us so we must have some tests to confirm it. Some tests are as follows:

1. When a wet blue litmus paper is inserted into the gas jar containing carbon dioxide, it turns red color due to the formation of carbonic acid.
2. When burning matchstick is placed near the mouth of gas jar containing carbon dioxide gas, it extinguishes because carbon dioxide gas Is non-supporter of combustion.

Laboratory Preparation of Ammonia Gas

When the mixture of Ammonium Chloride and Calcium Hydroxide is heated, Ammonia gas is produced.

Testing of Ammonia Gas

The produced Ammonia gas is not visible to us so we must have some tests to confirm it. Some tests are as follows:

1. When a wet red litmus paper is inserted into the gas jar containing ammonia, it turns blue color due to the formation of ammonium hydroxide base.
2. The gas produces a white fume of ammonium chloride when reacted with concentrated hydrochloric acid.