Ferric Sulfate

Ferric Sulfate or Iron (III) sulfate is a chemical compound that is a yellow crystalline solid or a grayish-white power. It is a salt that is soluble in water; a chemical agent with acidic properties. The non-flammable compound is considered toxic, harmful if swallowed, and can cause serious eye damage and skin irritation. It may be corrosive to some metals. Primary uses for ferric sulfate are for water purification and as a soil conditioner.

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Ferric Sulfate is a toxic, non-flammable chemical compound with the molecular formula Fe2O12S3. Its CAS is 10028-22-5. The dark brown or yellow chemical agent is produced by the reaction of sulfuric acid and an oxidizing agent. Ferric sulfate is used in different fields such as dentistry and dermatology. It is thought to present hemostatic properties by interacting chemically with certain blood proteins. Other applications include use as an odor agent, solids separation agent, and as a water treatment chemical. Solutions are used as a mordant in dying, and as a coagulant for industrial wastes. The compound is also used in the manufacture of pigments, and in pickling baths for aluminum and steel.


The FDA lists ferric sulfate as a direct food substance that is affirmed in the GRAS category (Generally Recognized as Safe). The primary hazard is a threat to the environment. Immediate steps should be taken to limit its spread in the environment.


Manufacturing and Production

Ferric Sulfate is often generated commercially as a solution as opposed to being isolated as a solid. On a large scale, it is produced by treating sulfuric acid with a hot solution of ferrous sulfate, and an oxidizing agent such as chlorine, nitric acid, and hydrogen peroxide.

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