Cobalt Sulfate, Cobalt Sulfate Heptahydrate, Cobalt Sulfate Anhydrous, Cobalt Vitriol, 10026-24-1, 10393-49-4

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Cobalt Sulfate, Cobalt Sulfate Heptahydrate, Cobalt Sulfate Anhydrous, Cobalt Vitriol, 10026-24-1, 10393-49-4

CAS Numbers and Forms

CAS No	Form	Chemical Formula	Molecular Weight	Properties
10124-43-3	Cobalt Sulfate Anhydrous	CoSO₄	154.996 g/mol	Odorless, pink solid; density 3.71 g/cm³; melting point 735 °C; paramagnetic
10393-49-4	Cobalt Sulfate Heptahydrate	CoSO₄·7H₂O	281.1 g/mol	Rose-pink crystals; density 1.948 g/cm³; melting point 98 °C; hygroscopic
10026-24-1	Cobalt(II) Sulfate Heptahydrate	CoSO₄·7H₂O	281.1 g/mol	Widely used industrially; highly soluble in water (362 g/L @ 20 °C); pH ~4

Appearance: Rose-pink crystals (hydrated form), odorless solid (anhydrous form)
Solubility: Highly soluble in water; slightly soluble in ethanol; more soluble in methanol
Stability: Hygroscopic; loses water between 41–71 °C
Magnetic Property: Paramagnetic due to Co²⁺ ions

IARC Classification: Group 2B – Possibly carcinogenic to humans
Hazard Codes:
- R49: May cause cancer by inhalation
- R42/43: May cause sensitization by inhalation and skin contact
- R50/53: Very toxic to aquatic organisms, long-term effects
GHS Pictograms: Health hazard, environmental hazard
Precautionary Statements:
- S36/37: Wear suitable protective clothing and gloves
- S61: Avoid release to the environment
- S60: Dispose of as hazardous waste

Product / Form	CAS No	Sectoral Suitability	Key Advantages	Production / Supply Notes
Cobalt Sulfate Heptahydrate (CoSO₄·7H₂O)	10026-24-1 / 10393-49-4	Batteries, electroplating, pigments, feed additives	High solubility, widely available, standard grade	Produced via cobalt oxide or hydroxide dissolution in sulfuric acid; global supply concentrated in China & Africa
Cobalt Sulfate Anhydrous (CoSO₄)	10124-43-3	High-temperature processes, catalysts, specialty chemicals	Higher stability at elevated temperatures, lower water content	Requires controlled dehydration of heptahydrate; limited producers, higher cost
Cobalt Chloride (CoCl₂·6H₂O)	7791-13-1	Pigments, humidity indicators, catalysts	Distinct color-change property, alternative pigment source	Produced from cobalt oxide and hydrochloric acid; less common in feed applications
Cobalt Nitrate (Co(NO₃)₂·6H₂O)	10026-22-9	Catalysts, ceramics, glass	Strong oxidizing properties, niche applications	Limited industrial use; produced via nitric acid route
Cobalt Carbonate (CoCO₃)	513-79-1	Feed additives, ceramics, pigments	Lower solubility, safer handling in feed	Produced via precipitation from cobalt sulfate; often intermediate for other salts
Cobalt Oxide (Co₃O₄ / CoO)	1308-06-1	Batteries, ceramics, catalysts	Stable oxide form, precursor for salts	Produced by thermal decomposition of cobalt salts; widely used in cathode materials

Battery sector: Heptahydrate is dominant due to solubility and ease of processing. Oxides are also critical precursors.
Electroplating: Sulfate salts (both anhydrous and hydrated) remain standard due to bath chemistry.
Pigments & Ceramics: Alternatives like cobalt chloride and carbonate are used depending on desired color tone and stability.
Feed additives: Heptahydrate and carbonate are most common, with carbonate preferred for safer handling.
Production: Most cobalt salts are derived from cobalt oxide/hydroxide via acid reactions.