The equation FeSO4 + 3K2S -> 3K2SO4 + Fe2S3

The chemical equation above depicts the reaction process between Iron (II) Sulfate (FeSO₄) and Potassium Sulfide (K₂S) to produce Potassium Sulfate (K₂SO₄) and Iron (III) Sulfide (Fe₂S₃).

Reaction conditions: For the reaction to occur, the reactants need to be mixed together in a suitable environment (usually a solution).

Reaction process: When FeSO₄ meets K₂S, a chemical reaction occurs producing K₂SO₄ and Fe₂S₃.

Observable phenomenon: During the reaction process, the color change in the solution when iron sulfide is formed is easy to notice, from the white color of FeSO₄ and K₂S to the deep yellow color of Fe₂S₃.