Here's why:
* Ionic Compound: Copper (II) 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⁻).
* Strong Bonds: These ionic bonds are very strong and require a significant amount of energy to break, which is why copper (II) sulfate remains solid at room temperature.
However, copper (II) sulfate can exist in different forms depending on the presence of water:
* Anhydrous Copper Sulfate (CuSO₄): This form is a white powder.
* Copper Sulfate Pentahydrate (CuSO₄·5H₂O): This form is the most common and is a bright blue crystalline solid. The water molecules are bound to the copper ion, creating a hydrated complex.
Both anhydrous and hydrated forms of copper sulfate are solids at room temperature.
