Understand the preparation of Ammonia. Click on the Link to Watch the VIDEO explanation: Watch Video
The test tube containing a mixture of ammonium chloride and calcium hydroxide is heated. After sometime ammonia gas is evolved. The gas is passed through the lime tower where the moisture is removed. Drying is necessary because water vapour is one of the product formed. Ammonia gas being highly soluble in water has to be dried quickly to prevent from dissolving. Dried ammonia gas being lighter than air is collected upward in the jar by downward displacement of air. Calcium chloride is left in the test tube. A moist red litmus paper is used check presence of ammonia in the gas jar. The red litmus paper turns blue because ammonia is basic.
The test tube containing a mixture of ammonium chloride and calcium hydroxide is heated. After sometime ammonia gas is evolved. The gas is passed through the lime tower where the moisture is removed. Drying is necessary because water vapour is one of the product formed. Ammonia gas being highly soluble in water has to be dried quickly to prevent from dissolving. Dried ammonia gas being lighter than air is collected upward in the jar by downward displacement of air. Calcium chloride is left in the test tube. A moist red litmus paper is used check presence of ammonia in the gas jar. The red litmus paper turns blue because ammonia is basic.
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