dry ammonia gas has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. why?

Question

Answer

Dry ammonia does not contain OH- ions so id does not have any effect on red litmus paper.Ammonia reacts with water to form ammonium hydroxide. Ammonium hydroxide is a base and hence it turns red litmus blue.NH3 (g) + H2O (l) → NH4OH (aq)So now in moist form it can furnish OH-and it can turns red litmus paper blue

Answer

Ammonia is basic in nature .and ammonia can observe oH negative ions only in water so it turns red to blue

Answer

Because of ionisation in aqueous medium. OH negative, formed in the reaction acts with litmus paper.  NH3 isn't in the dissociated form in dry condition.

Answer

because dry gas cannot produce ions to react on litmus

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because dry ammonia doesn't have ions in gaseous for but when dissolved in water . it get ionised and became a acid

Answer

when ammonia is added in water ,it attracts 1 H+ of H2O ,thus becoming NH4+ and releasing OH- group of water which gives +alkali test

Answer

Introduction:
Ammonia (NH3) is a compound composed of nitrogen and hydrogen atoms. It exists as a gas at room temperature but can also dissolve in water to form an aqueous solution of ammonia. When discussing the action of ammonia on litmus paper, it is important to differentiate between dry ammonia gas and the solution of ammonia in water.

Dry Ammonia Gas:
- When dry ammonia gas comes into contact with litmus paper, it does not exhibit any action.
- Litmus paper is an indicator that changes color in the presence of acidic or basic substances.
- Since dry ammonia gas does not show any reaction with litmus paper, it indicates that it is neither acidic nor basic.
- This is because dry ammonia gas does not contain any hydroxide ions (OH-) that are responsible for the basic properties of ammonia.

Solution of Ammonia in Water:
- When ammonia dissolves in water, it forms an aqueous solution of ammonia. This solution is basic in nature.
- The reason behind the basic nature of the solution is the presence of hydroxide ions (OH-) generated by the reaction between ammonia and water.
- Ammonia molecules react with water molecules through a process called hydration, which results in the formation of ammonium ions (NH4+) and hydroxide ions (OH-).
- The equilibrium reaction can be represented as follows: NH3 + H2O ⇌ NH4+ + OH-
- The hydroxide ions (OH-) present in the solution are responsible for turning red litmus paper blue.
- Red litmus paper is red because it changes color in the presence of acidic substances. The hydroxide ions in the ammonia solution neutralize the acidic properties of the litmus paper, causing it to turn blue.

Conclusion:
In summary, dry ammonia gas does not exhibit any action on litmus paper because it is neither acidic nor basic. However, when ammonia dissolves in water to form an aqueous solution, it becomes basic due to the presence of hydroxide ions. These hydroxide ions are responsible for turning red litmus paper blue.

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