* Cobaltic chloride refers to CoCl₃, where cobalt has an oxidation state of +3. It's a rare and unstable compound, easily decomposing to form cobaltous chloride and chlorine gas.
* Cobaltous chloride refers to CoCl₂, where cobalt has an oxidation state of +2. This is the more common and stable form of cobalt chloride.
Here's a table summarizing the key differences:
| Feature | Cobaltic Chloride (CoCl₃) | Cobaltous Chloride (CoCl₂) |
|-------------------|--------------------------|-----------------------------|
| Cobalt Oxidation State | +3 | +2 |
| Stability | Unstable, decomposes easily| Stable |
| Color | Dark green | Blue |
| Common Name | Less common | More common |
In everyday use, "cobalt chloride" almost always refers to cobaltous chloride (CoCl₂). This is because cobaltic chloride is too unstable for practical applications.
