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iron iii arsenate formula is an inorganic compound with the chemical formula FeAsO4. It has weak oxidizing and reducing powers, but redox reactions can still take place. The solid is a green or brown powder that is insoluble in water. It is toxic by ingestion and inhalation and is a strong irritant. It is used in the manufacture of insecticides.

The most common form of iron iii arsenate is found in nature in the mineral scorodite or hematite, though it may also occur as a separate mineral called ferric orthoarsenate (FeAsO3H2H4O6). It can be obtained as an anhydrous salt, which is a dull white insoluble substance. When it is treated with sodium hydrogen carbonate solution, effervescence takes place and a soluble double arsenate is formed. It can also be obtained in the hydrate form by precipitating it from a solution of water. Both the hydrate and anhydrous forms are slightly acidic.

Inhalation and ingestion of iron iii arsenate can cause liver damage, kidney disease, skin diseases, neurotoxicity, and other health problems. Symptoms of exposure include irritation of the respiratory tract, skin burns, nausea, vomiting, gastrointestinal tract upset, and lung damage. It can be fatal if swallowed or inhaled in large quantities.

It is listed as a hazardous air pollutant under the Clean Air Act. It is a suspected carcinogen and may be fatal if inhaled or in contact with the eyes. It is also corrosive and may produce irritating, noxious, and/or toxic gases during combustion. It can contaminate soil and water.