1.Chemical Name: ferrous sulfate 2.Molecular Formula : FeSO4·7H2O, FeSO4·nH2O 3.Molecular Weight: 278.02(Heptahytrate) 4.Character:Pale,blue-green crystals or granules that are efflorescent in dry air.In moist air,it oxidizes readily to form a brown-yellow,basic ferric sulfate. It's soluble in water, insoluble in ethanol. 5.Usage: It is used as nutrient, fruit and vegetable chromogenic reagent.