The chemical formula for cobalt acetate hydrate, which is most commonly encountered as cobalt(II) acetate tetrahydrate, is (CH₃COO)₂Co ⋅ 4 H₂O.
Understanding Cobalt(II) Acetate Tetrahydrate
Cobalt acetate hydrate is a chemical compound primarily known for its role in various industrial and laboratory applications. While "cobalt acetate hydrate" can refer to different hydrated forms, the most stable and widely recognized version is the tetrahydrate, meaning it contains four molecules of water associated with each formula unit of cobalt acetate. This specific form is often seen as a pink or reddish-pink crystalline solid.
Breaking Down the Chemical Formula
The formula (CH₃COO)₂Co ⋅ 4 H₂O precisely describes the composition of cobalt(II) acetate tetrahydrate:
- (CH₃COO)₂: This represents two acetate ions. The acetate ion (CH₃COO⁻) is derived from acetic acid, and it serves as the ligand binding to the cobalt atom.
- Co: This signifies a cobalt atom, specifically in its +2 oxidation state (cobalt(II)). This is the central metal ion in the compound.
- ⋅ 4 H₂O: The "dot" indicates that four molecules of water (H₂O) are integrally associated with each formula unit of cobalt(II) acetate. These water molecules are part of the crystal structure and are known as "waters of hydration."
The presence of these water molecules distinguishes the hydrated form from its anhydrous counterpart (which would simply be (CH₃COO)₂Co).
Key Identifiers
For precise identification and handling, several key identifiers are associated with cobalt(II) acetate tetrahydrate:
| Property | Value |
|---|---|
| CAS Number | 6147-53-1 |
| EC Number | 200-755-8 |
| Chemical Formula | (CH₃COO)₂Co ⋅ 4 H₂O |
Characteristics and Significance
Cobalt(II) acetate tetrahydrate is often valued for its solubility in water and its properties as a source of cobalt. It finds use in various applications, including:
- Catalysis: As a precursor for cobalt-containing catalysts in organic reactions.
- Pigments: In the production of pigments for ceramics, glass, and paints.
- Drying Agent: In some applications, it can act as a drying agent or a source of cobalt for other chemical processes.
Its specific formula, (CH₃COO)₂Co ⋅ 4 H₂O, ensures consistent composition and predictable behavior in these diverse uses.
