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 Ferrous sulfate Heptahydrate appear light blue or green columnar crystal grain, odourless, taste salty and convergence, along with the density of 0.999 g at 25 ° C/ml, 14.6 millimeters of mercury vapour pressure ° C (25 ° C), storage temperature, the solubility of 25.6 g / 100 ml (20 ° C), water soluble 25.6 g / 100 ml (20 ° C), sensitive, gas sensor and hygroscopicity, Merck 14. Soluble in water, glycerin. Insoluble in ethanol, corrosive, deliquescence weathering. In industry, it is used in the manufacture of iron salt flocculants, ink dye used in coal, grass tanning agent, bleach, wood preservative and disinfectant. In agriculture, it is used as chemical fertilizers, herbicides, and pesticides processing, control of orchard pests of wheat and fruit rot stem, sustainable development of the root tree moss and lichen etc. Also can be used to make fertilizers, a catalyst for the manufacture of chlorophyll, the absorption of plants, plant plays an important role. In the pharmaceutical, it is used as pharmaceutical agents and local convergence agent, it is blood red blood cells in the body iron content of synthetic raw materials. its