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**Molecular formula (copper sulfate):** CuSO₄ **Molecular formula (cupric sulfate):** CuSO₄·5H₂O **Molar mass (anhydrous):** 159.610 g/mol **Molar mass (pentahydrate):** 249.686 g/mol **Description:** Anhydrous copper sulfate appears as a white powder and is an ionic compound composed of copper cations (Cu²⁺) and sulfate anions (SO₄²⁻). Upon exposure to water, it undergoes a color change from white to blue, forming the pentahydrate form, known as bluestone (copper sulfate pentahydrate CuSO₄·5H₂O), which crystallizes into striking azure blue crystals. **Applications:** Anhydrous copper sulfate is commonly used as a moisture indicator. Bluestone, the hydrated form, is used in the production of pesticides (e.g., for wood preservation) and as an algicide in swimming pools.
