Ferrous sulphate Heptahydrate feso4.7h2o for water treatment

Bluegreen monoclinic crystals or particles, odorless. Weathered in dry air, the surface is oxidized into brown basic iron sulfate in dry air. It becomes a tetrahydrate complex at 56.6°C and a monohydrate complex at 65°C. Water, barely more than ethanol. Its aqueous solution oxidizes slowly in the air when it is cold and oxidizes quickly when it is hot. Adding alkali or exposure to light can accelerate its oxidation. Relative density (d15)1.897. Irritating. Anhydrous ferrous sulfate is a white powder. It contains crystal water and is light green crystals. The crystals are commonly known as "green vitriol". When dissolved in water, they are light green. Ferrous sulfate can be used as chromatographic analysis reagent and drop analysis to determine platinum, white, nitrite and nitrate. Ferrous sulfate can also be used as a reducing agent, ferrite production, water purification, polymerization catalyst, photographic plate making, etc.