The formula for hydrated copper II sulfate is CuSO₄·xH₂O, where "x" represents the number of water molecules associated with each copper sulfate molecule.

Here's a breakdown:

* CuSO₄ represents the copper II sulfate molecule itself.

* · indicates that water molecules are associated with the copper II sulfate.

* xH₂O represents the water of hydration, where "x" is the number of water molecules.

The value of "x" can vary depending on the specific hydrate. Some common hydrates include:

* CuSO₄·5H₂O: Copper(II) sulfate pentahydrate

* CuSO₄·3H₂O: Copper(II) sulfate trihydrate

* CuSO₄·H₂O: Copper(II) sulfate monohydrate

It's important to note that the formula without a specific "x" value represents the anhydrous form of copper II sulfate, meaning it has no water molecules associated with it.