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Physical Properties of Ammonia

Dry ammonia g...

Question

Dry ammonia gas has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue.
Why is it so ?

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Solution

Ammonia in water forms ammonium hydroxide. These hydroxide ions turns red litmus blue.

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Q. Dry ammonia has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. Why is it so?

Q. Assertion :Nitrogen turns red litmus paper blue. Reason: Ammonia is a basic gas.

Ammonia is a brown coloured, pungent-smelling gas which turns moist blue litmus paper into the red colour.

Q. Assertion :When a piece of moist red litmus paper is placed in a gas jar of ammonia it turns blue. Reason: The ammonia gas is basic in nature and this property converts the red litmus to blue.

What would you observe when :

(a) blue litmus is introduced into a solution of hydrogen chloride gas,

(b) red litmus paper is introduced into a solution of ammonia in water,

(c) red litmus paper is introduced in caustic soda solution?

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