1. Water Evaporation: Copper sulfate usually exists as a hydrate, meaning it has water molecules bound to it. When heated, the water molecules will evaporate first, leaving behind anhydrous copper sulfate (CuSO4).
2. Anhydrous Copper Sulfate: The anhydrous form is a white powder. It is very hygroscopic, meaning it readily absorbs moisture from the air, turning back into the hydrated form (blue crystals).
3. Decomposition at Higher Temperatures: If the temperature is further increased, anhydrous copper sulfate will start to decompose. This happens at around 650°C. The decomposition reaction produces copper oxide (CuO) and sulfur trioxide (SO3) gas.
4. Sulfur Trioxide Behavior: The sulfur trioxide gas will likely react with any moisture present to form sulfuric acid (H2SO4), a strong acid. This acid can be corrosive.
In Summary:
* Evaporation of the water: This is the first stage.
* Formation of anhydrous copper sulfate: This is a white powder.
* Decomposition at high temperatures: This produces copper oxide and sulfur trioxide gas, which can form sulfuric acid.
Important Note: Handling copper sulfate and its decomposition products requires appropriate safety measures, including:
* Ventilation: Ensure good ventilation to avoid inhaling fumes.
* Protective gear: Wear gloves, goggles, and a lab coat to protect your skin and eyes.
* Proper disposal: Dispose of the residues according to local regulations.
