Lab Alley’s Ferrous Sulfate, also known as Ferrous Sulfate Hydrate, Iron(II) Sulphate Hydrate, Green Vitriol, and Iron Vitriol, is the hydrate of Iron(2+) Sulfate having the chemical formula H2FeSO5 or FeSO4-xH2O. It appears as blue-green odorless air/moisture sensitive granules and is water soluble at ambient conditions. When heated to decomposition, it emits toxic fumes of Sulfur Oxides. An ACS Grade reagent is a chemical that meets the purity requirements of the American Chemical Society. For dependable, consistent, and repeatable findings, ACS Grade reagents can be utilized in high-quality research labs. In the United States of America (USA), Lab Alley sells its high-quality Ferrous Sulfate Granular, ACS Grade online at laballey.com.