What is FeO? Important knowledge about FeO.

1. Definition of FeO

FeO, also known as Iron(II) oxide, is a black or dark brown solid consisting of two atoms: an iron (Fe) atom and an oxygen (O) atom. The molecular weight of FeO is 71.844, with the atomic weight of iron being 55.845 and oxygen being 15.999. A FeO molecule is formed from one Fe₂+ ion and one O₂- ion.

2. Properties of FeO

2.1 Physical properties of FeO: FeO is solid at room temperature, black or dark brown in color, odorless, and its pH cannot be determined because it is insoluble in water.
2.2 Chemical properties of FeO: FeO can react with strong acids to form Iron(II) salts and hydrogen gas.

3. Common FeO chemical reactions:

   • Reaction with acid:
     FeO + 2HCl -> FeCl₂ + H₂O
     FeO + H₂SO₄ -> FeSO₄ + H₂O
   • Reaction with salt:
     FeO + 2NaCl -> 2NaO + FeCl₂

4. Preparation of FeO:

4.1 Laboratory preparation of FeO: In the laboratory, FeO can be prepared by reacting iron with oxygen at high temperatures.
4.2 Industrial preparation of FeO: In industry, FeO is usually produced from the iron smelting process or by reacting iron with oxygen in the air at high temperatures.