What is NH4I? Important knowledge about NH4I

1. Definition of NH₄I
   NH₄I, also known as Ammonium Iodide in English, is a chemical compound with the formula NH₄I. Its molar mass is 145.04 g/mol. The structure of NH₄I molecule consists of the ammonium ion NH₄+ and the iodide ion I-.

2. Properties: NH₄I
   2.1 Physical properties of NH₄I
   NH₄I is a white crystalline solid without smell and has a neutral PH level. This substance is easily soluble in water and it is not highly flammable.
   2.2 Chemical properties of NH₄I
   Like most iodides, NH₄I can be decomposed by oxidation in the air and light, turning into iodine and ammonia.

3. Common chemical equations involving NH₄I
   It can be said that NH₄I can react with various other substances, including metals, acids, non-metals, and salts.

Here are some examples of reactions:
NH₄I + NaOH -> NH₃ + NaI + H₂O
NH₄I + AgNO₃ -> AgI + NH₄NO₃

4. Synthesis of NH₄I
   4.1 Laboratory synthesis of NH₄I
   To synthesize NH₄I in the laboratory, we usually use the reaction between hydriodic acid (HI) and ammonia (NH₃):
   HI + NH₃ -> NH₄I
   4.2 Industrial synthesis of NH₄I
   In industry, NH₄I is usually synthesized from ammonia and iodine. The reaction occurs according to the equation:
   2NH₃ + I₂ -> 2NH₄I