- Registry number
- CHEM-007
- Preferred designation
- Copper(II) sulfate pentahydrate
- Common names
- Blue vitriol · bluestone
- Chemical formula
- CuSO₄·5H₂O
- CAS registry
- 7758-99-8
- PubChem CID
- 24463
- Formula mass
- 249.69 g/mol
- Class
- Hydrated transition-metal sulfate
Description & appearance
Intensely blue crystalline solid; hydrate loss changes appearance.
Occurrence & historical provenance
A manufactured and historically traded copper salt, associated with the broader history of mineral processing, agriculture, and electrochemistry.
Established uses
Electrochemistry education, laboratory reagents, and certain regulated agricultural and industrial applications.
Hazards & handling context
Harmful if swallowed; can seriously affect aquatic life. Not interchangeable with anhydrous copper sulfate.
Important distinctions
The five waters of crystallization are part of the named compound and affect its formula mass.
Source ledger
The following reference records were consulted for chemical identity and general descriptive claims. Industrial grades, formulations, and mixtures may have different hazard profiles.
Catalogued 2026-11-11 · PyreArms 0.2.0. This is an authored reference entry, not a certificate of laboratory analysis.