Magnesium nitride and water react and form a white precipitate, magnesium hydroxide and ammonia gas. Magnesium hydroxide is not s soluble hydroxide in water. However due to existing hydroxyl ions in the aqueous solution, solution will become basic. Formed ammonia gas is a basic gas too and can be identified by several tests.
Magnesium nitride is an inorganic compound which is made by magnesium and nitrogen. At room temperature and pressure, it is a pale yellow powder.
According to the stoichiometry , 1 mol of Mg3N2 react with 6 mol of water and give 3 mole of Mg(OH)2 and 3 mol of NH3.
Here, I am going to explain how to prepare ammonia gas using magnesium metal. Be careful, when you conduct this experiment because ammonia is a toxic gas and be careful from burnings too.
Find a magnesium piece and burn it in the air. Magnesium oxide and magnesium nitride are given as products.
Then add products to water. You can test ammonia gas which is released as a product from the reaction.
Because magnesium oxide is also with magnesium nitride, magnesium oxide also give magnesium hydroxide precipitate.
Conduct the same experiment which is explained above. Because ammonia gas is produced, there should be a nitrogen source when pre-reactions are occurred. But, we don't know what are the products given by the first reaction. But, I write them now to make easy the understanding of yours.
Magnesium nitride dissolves very well in water and reacts with water to produce magnesium hydroxide and ammonia gas. Magnesium hydroxide is a white colour precipitate.
Due to formation of white colour magnesium hydroxide precipitate, someone can say or see, as magnesium nitride is insoluble in water. But, truth is magnesium nitride is soluble in water.
Questions asked by students
Statement 3 is wrong. This reaction emits ammonia gas as a product. ammonia is a toxic gas and can harm people.
Yes. A white precipitate is formed when magnesium nitride is added to water. Therefore, magnesium nitride is soluble in water.