The iron was burned in bromine. The resulting salt was added to a solution of potassium carbonate

The iron was burned in bromine. The resulting salt was added to a solution of potassium carbonate, and a brown precipitate formed, which was filtered off and calcined. The solid residue was dissolved in hydroiodic acid. Write the equations for the four reactions described.

1) When iron is burned in bromine, iron (II) bromide is formed:

Fe + Br2 (t) = FeBr2

2) Interaction of the obtained iron (II) bromide with potassium carbonate:

FeBr2 + K2CO3 = FeCO3 ↓ + 2KBr

3) The precipitate of iron (II) carbonate decomposes when heated:

FeCO3 (t) = FeO + CO2 ↑

4) Dissolution of iron (II) oxide in hydroiodic acid:

FeO + 2HI = FeI2 + H2O