Ammonia, a gas that dissolves in water to form an ammonia solution. If you open a bottle of ammonia solution, some ammonia molecules will escape and diffuse out of the bottle. Ammonia is an alkali and changes red litmus paper blue.
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Explanation:
The ammonia fountain is a classic demonstration used to observe the solubility of ammonia in water. Universal indicator is used to see the alkaline nature of the solution formed.
Demonstration
This demonstration experiment can be used to illustrate the very high solubility in water of ammonia. Ammonia solution is seen to be alkaline and various indicator colour changes can be demonstrated. A flask, fitted with a glass jet, is filled with dry ammonia. Injecting water into the flask dissolves the ammonia and causes a fountain via the jet.
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