Cobaltous sulfate

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An amorphous red powder. Cobaltous sulfate occurs in nature as the mineral bieberite. It is prepared synthetically by the action of Sulfuric acid on Cobaltous oxide. It has several states of hydration ranging from the monohydrate to heptahydrate. Cobaltous sulfate is used as a red pigment in ceramic glazes and as a drier in oil paints, varnishes, and lithographic inks.

Synonyms and Related Terms

cobalt (II) sulfate; red vitriol; cobaltous sulphate (Br.)


  • Carcinogen.
  • Toxic by ingestion.
  • Contact causes irritation.
  • ThermoFisher: SDS

Physical and Chemical Properties

Hexahydrate form is water soluble.

Composition CoSO4
CAS 10124-43-3
Melting Point 735 C
Density 3.472 g/ml
Molecular Weight mol. wt. = 155.00
Boiling Point 96.8 C

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2510