Ferric sulfate

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Grayish-white powder formed by adding acid sulfuric acid to hydroxide ferric hydroxide. Ferric sulfate is very hygroscopic. It is used as a mordant in textile dyeing and as a component in gall ink iron gall inks. Ferric sulfate is also used in water purification systems. Ferric sulfate occurs naturally in minerals with varying states of hydration, including lausenite [Fe2(SO4)3-6H2O], kornelite [Fe2(SO4)3-7H2O], coquimbite [Fe2(SO4)3-9H2O], and quenstedtite [Fe2(SO4)3-10H2O].

Synonyms and Related Terms

ferric sulphate (Br.); ferric persulfate; ferric sesquisulfate; ferric tersulfate



Other Properties

Slightly soluble in water and alcohol. Insoluble in organic solvents.

Composition Fe2(SO4)3
CAS 10028-22-5
Melting Point 480 (d)
Density 2.0-2.1
Molecular Weight 399.88

Hazards and Safety

Non-combustible. Decomposes with light


  • Richard S. Lewis, Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 3963

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