Sodium amide (NaNH2) can be prepared by the reaction of sodium with ammonia gas. This reaction helps us to discover important facts about ammonia. When, sodium reacts with ammonia, sodamide and hydrogen gas are formed.
Sodium reacts with ammonia gas and produce sodamide and hydrogen gas as products. But usually, liquefied ammonia is used to prepare sodamide in this reaction. The chemical equation of sodamide preparation is below.
Na + NH3 → NaNH2 + H2
Sodamide is called as Sodium amide and sodium azanide.
This is a redox reaction. This equation can be balanced easily by inspection methods (you can try redox balancing methods if you wish).
2Na + 2NH3 → 2NaNH2 + H2
Due to formation of hydrogen gas, fires can be occurred. Also, this reaction tells us about special cases of ammonia gas.
Ammonia is famous as a basic gas in the chemistry. But in this reaction, hydrogen gas is emitted with the reaction of sodium.
Usually, metals emits hydrogen gas when react with acids such as sodium and dilute HCl reaction. This is a similar reaction to metal - acid reaction because sodium is a metal and hydrogen gas is released as a product. So ammonia should has acidic characteristics too like basic properties to show this kind of reaction.
Due to oxidation of sodium, ammonia is considered as an oxidizing agent.
In sodium and ammonia gas reaction. sodium is oxidized. Therefore, sodium behaves as a reducing agent. Reduction is occurred in ammonia molecule as hydrogen gas produced. Oxidation number of hydrogen is reduced from +1 to 0.
Answer is 3.
Sodamide, product given by the reaction sodium and ammonia reacts with water to produce sodium hydroxide and ammonia gas. Therefore this aqueous solution should have a higher pH value.
Aqueous ammonia means, a aqueous ammonium hydroxide solution. In the presence of water, all alkali metals reacts with water to form metal hydroxide and hydrogen gas. In this case, sodium has water to react and readily and fastly reacts to produce sodium hydroxide and hydrogen gas.