Copper(II) sulfate pentahydrate
Copper(II) sulfate pentahydrate (CAS: 7758-99-8), with the linear formula CuSO₄ · 5H₂O and a molecular weight of 249.69 g/mol, is a vibrant blue crystalline solid. It is widely recognised for its role as a catalyst and reagent in chemical synthesis and various industrial processes. This compound serves as an essential source of copper ions in numerous applications, from agriculture to analytical chemistry.
- IUPAC
- Blue Vitriol,Cupric sulfate pentahydrate,Sulfuric acid, copper(II) salt (1:1) pentahydrate
- Synonyms
- Blue VitriolCupric sulfate pentahydrateSulfuric acid, copper(II) salt (1:1) pentahydrate

Catalysis
Copper(II) sulfate pentahydrate is a well-established catalyst in various organic transformations, including click chemistry reactions and oxidation processes. Its ability to participate in redox cycles makes it valuable for facilitating chemical reactions.
Chemical Synthesis
It serves as a key reagent and precursor in the synthesis of other copper compounds and organometallic complexes. Its defined stoichiometry and reactivity are crucial for controlled chemical production.
Analytical Reagent
This compound is used in analytical chemistry for titrations and as a component in specific chemical tests. Its consistent purity ensures reliable results in laboratory settings.
Electroplating and Surface Treatment
Copper sulfate is employed in electroplating baths to deposit a layer of copper onto various substrates, enhancing conductivity and corrosion resistance. It is also used in surface treatment applications.
| Molecular weight | 249.69 |
|---|---|
| Linear formula | CuSO4 · 5H2O |
| Assay | ≥99.0% |
| Grade | ACS reagent |
| Vapour pressure | 7.3 mmHg (25 °C) |
| Loss on drying | 35-36.5% loss on drying, 250 °C |
| Impurities tested | organic volatile impurities, in accordance (GC)in accordance |
| Melting point | 110 °C (dec.)(lit.) |
| Suitability | passes test for appearance of solution |


Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H410Very toxic to aquatic life with long-lasting effects
Precautionary statements
- P273Avoid release to the environment
- P305IF IN EYES
- P501Dispose of contents and container per local regulations
| Protective equipment | dust mask type N95 (US), Eyeshields, Faceshields, Gloves |
|---|---|
| Transport (UN / ADR) | UN 3077 9 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn,N |
| Risk statements (R) | 22-36/38-50/53 |
| Safety statements (S) | 22-60-61 |
| Cation traces | As: ≤5 mg/kgCa: ≤50 mg/kgFe: ≤30 mg/kgK: ≤100 mg/kgMg: ≤50 mg/kgNa: ≤200 mg/kgNi: ≤50 mg/kgPb: ≤50 mg/kg |
| Anion traces | chloride (Cl-): ≤100 mg/kg |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Quality Level | PREMIUM |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Copper(II) sulfate pentahydrate used for?
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Copper(II) sulfate pentahydrate is primarily used as a catalyst in chemical synthesis, including click chemistry, and as an analytical reagent. It also finds applications in electroplating, surface treatment, and as a source of copper ions in various industrial processes.
What are the CAS number and chemical formula for Copper(II) sulfate pentahydrate?
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The CAS number is 7758-99-8, and its linear formula is CuSO₄ · 5H₂O.
What grade and purity does Tech Serve Solutions supply for Copper(II) sulfate pentahydrate?
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Tech Serve Solutions supplies Copper(II) sulfate pentahydrate in an ACS reagent grade with an assay of ≥99.0%.
How should Copper(II) sulfate pentahydrate be handled safely?
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Handle with appropriate personal protective equipment including a dust mask (N95 type), eyeshields, face shield, and gloves. Avoid inhalation of dust and ensure adequate ventilation. It is harmful if swallowed, causes skin and eye irritation, and is very toxic to aquatic life with long-lasting effects.
How is Copper(II) sulfate pentahydrate packed and exported by TSS?
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As a specialist global supplier, Tech Serve Solutions exports chemicals with appropriate packaging and documentation to meet international shipping regulations. Specific packing details are available upon request.
How can I request a quote or sample for Copper(II) sulfate pentahydrate?
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To request a quote or sample, please contact our sales team through the website or by phone, providing the product name and CAS number (7758-99-8).
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