Ferric sulfate

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Grayish-white powder formed by adding Sulfuric acid to Ferric hydroxide. Ferric sulfate is very Hygroscopic. It is used as a mordant in textile dyeing and as a component in 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)3-5H2O], Kornelite [Fe2(SO4)3-7H2O], Coquimbite [Fe2(SO4)3-9H2O], and Quenstedtite [Fe2(SO4)3-10H2O].

Synonyms and Related Terms

iron III sulfate; ferric sulphate (Br.); ferric persulfate; ferric sesquisulfate; ferric tersulfate



Raman (U of Arizona)

Lausenite Raman RRUFF X070004.png


  • Non-combustible.
  • Decomposes with light
  • Respiratory system irritant
  • Fisher Scientific: SDS

Physical and Chemical Properties=

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

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

Resources and Citations

  • 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