2FeSO4 (s) → Fe2O3 (s) + SO2 (g) + SO3 (g)
In this reaction, ferrous sulphate breaks down into three products: iron(III) oxide (Fe2O3), sulphur dioxide (SO2), and sulphur trioxide (SO3).
- Iron(III) oxide (Fe2O3): This is a reddish-brown solid that is commonly known as rust. It is the main component of rust that forms on iron objects when they are exposed to oxygen and water.
- Sulphur dioxide (SO2): This is a toxic gas that has a pungent odor. It is released into the atmosphere as a result of various industrial processes, such as the burning of fossil fuels. Sulphur dioxide can contribute to environmental problems such as acid rain and respiratory illnesses.
- Sulphur trioxide (SO3): This is a highly reactive gas that can react with water to form sulphuric acid (H2SO4). Sulphur trioxide is used in the production of various industrial chemicals, such as fertilizers, explosives, and dyes.
It's important to note that the thermal decomposition of ferrous sulphate is a high-temperature process and requires significant heating to initiate. The specific temperature at which the decomposition occurs can vary depending on the experimental conditions.
