Chinese Name: Ferrous sulfate monohydrate [1] Chinese alias: ferric sulfate (II) hydrate; ferrous sulfate; ferrous sulfate (monohydrate); ferrous sulfate, dry goods, green vitriol, jarosite, iron fertilizer English Name: Ferrous sulfate monohydrate English Name: Green vitriol; IRON SULFATE, HEPTAHYDRATE; IRON (II) SULFATE; IRON (II) SULFATE, HYDRATE; IRON (II) SULFATE, HYDROUS; IRON (II) SULPHATE 7-HYDRATE; iron (2 +) sulfate hydrate (1: 1: 1) CAS Number: 13463-43-9 [2] EINECS No.: 231-753-5 Customs Code: 28332910 Molecular formula:?? FeSO · H O Molecular Weight: 169.9229 Melting point: 64 ℃ boiling point : 330 ° C at 760 mmHg Vapor Pressure: 3.35E-05mmHg at 25 ° C 2 chemical properties soluble in water (1g / 1.5ml, 25 ℃ or 1g / 0.5ml boiling water). Insoluble in ethanol. With a reduction. Decomposition by high fever and emit toxic gases. In the laboratory, can be obtained by reacting copper sulfate solution with the iron. In dry air will weathering. In humid air easily oxidized into insoluble in water, basic ferric brown. 10% aqueous acidic to litmus (Ph value of about 3.7). Was heated to 70 ~ 73 ℃ lost 3 molecules of water, to 80 ~ 123 ℃ lose 6 molecules of water, to above 156 ℃ into basic iron sulfate. 3 Preparation for the role and use of iron salt, iron oxide pigments, mordant, purifying agent, preservatives, disinfectants; medicine for anti-anemia drugs, local convergence agents and blood agents, can be used to cause chronic uterine fibroids blood loss; analytical reagents and manufacturing ferrite materials; iron supplements as feed additives; used as a pesticide in agriculture, can prevent wheat smut, apple and pear scab scar, fruit rot; used as a food grade nutritional supplements, such as iron supplements, fruit and vegetable coloring agent. [3] can be used as fertilizer, can remove the trunk moss and lichens. Manufacturing of magnetic iron oxide, iron oxide red and blue inorganic pigments, iron catalysts and materials poly ferric sulfate. Also used for chromatographic analysis reagents.