Here's why:
* CoCl₂ represents cobalt chloride.
* 6H₂O represents six water molecules.
* · is used to indicate that the water molecules are attached to the cobalt chloride, forming a hydrate.
The formula you provided, CoCL2 6H2O, is incorrect because it uses a space instead of a dot to separate the cobalt chloride and water molecules. This can be misinterpreted and is not the standard way to write the formula.
