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? ​

Answer 1

Answer:

dry Ammonia gas has no action on litmus paper but a solution of ammonia in water turns red litmus blue . This is because , in the absence of water it cannot split apart or dissociate into ions . ➡Hence it forms ammonium Hydroxide ( NH4OH) this is basic in nature . Hence it turns blue litmus red .

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Answer 2

Explanation:

NH3 is basic in nature,but litmus paper needs ions to change its color. As it is seen that NH3 doesn’t have any ion,so it is unable to change the color of litmus. On the other hand when NH3 reacts with water,NH4OH(ammonium hydroxide) is formed which is a base and it contains NH4+ ion and OH- ion. Since basic ion is present,hence it changes the red litmus paper blue.