Cobalt sulphate extra pure

Cobalt sulphate extra pure is a high-purity form of cobalt(II) sulfate heptahydrate (CoSO₄·7H₂O), typically ≥97% assay, supplied as red crystalline powder or small red crystals for laboratory and analytical use.​

Identity and Composition

Chemical name: Cobalt(II) sulfate heptahydrate.​

Molecular formula: CoSO₄·7H₂O; molecular weight 281.10 g/mol.​

Grade specifications: Assay 97–102% (complexometric), Cl ≤0.02%, Pb ≤0.005%, Fe ≤0.005%; Co content 20.3–21.4%.​

Physical Properties

Appearance: Red crystalline powder.​

Odor: Odorless.​

Density: 2.03 g/cm³.​

Melting point: 98 °C; boiling point ~735 °C.​

Solubility: Highly soluble in water (60.4 g/100 g at 30 °C); slightly soluble in alcohol.​

pH: ~4 (solution).​

Typical Uses

Extra pure cobalt sulphate serves as a reagent in analytical chemistry, catalyst preparation, electroplating baths, and as a cobalt source in pigments, ceramics, and animal feed supplements.​

Handling and Safety

Hazardous (H302, H317, H334, H341, H350i, H360F, H410); harmful if swallowed, skin/respiratory sensitizer, suspected carcinogen/reprotoxin, very toxic to aquatic life. Store sealed; use PPE.​

For catalog purposes: “Cobalt sulphate extra pure, CoSO₄·7H₂O ≥97%, red crystals, mp 98 °C, highly water-soluble, for reagents/plating; toxic sensitizer.”​