Here's why:

* Ionic Compound: Copper sulfate is an ionic compound, meaning it's formed by the electrostatic attraction between positively charged copper ions (Cu²⁺) and negatively charged sulfate ions (SO₄²⁻).

* Polar Solvent: Water is a polar solvent, meaning it has a positive and negative end due to the uneven sharing of electrons.

* Hydration: When copper sulfate is added to water, the water molecules surround the copper and sulfate ions, forming hydration shells. This weakens the ionic bonds in the copper sulfate crystal lattice, allowing the ions to dissolve in the water.

However, the solubility of copper sulfate is temperature-dependent. It becomes more soluble as the temperature increases.

Let me know if you have any other questions!