3. It is a reversible chemical change. Heat the hydrated copper (II) sulfate for 10 minutes. x H2O) is heated to drive off all the water. The equation is: CuSO4 • 5 H20 → CuSO4(anhydrous) + 5 H2O If we start with 9.63 g of hydrated salt and have 6.16 g of anhydrous CuSO4 after heating, find the number of water molecules associated with each CuSO4 formula unit. 5H2O(s) copper sulfate hydrate (before heating) CuSO4(s) copper sulfate anhydrous (after heating). 2. 1 g + 4 (16. It loses 1. The blue colour of the hydrated compound should gradually fade to the greyish-white of anhydrous copper(II) sulfate. Take a small quantity of copper sulphate crystals. There are 5 molecules of water incorporated in the structure. Avoid over-heating, which may cause further decomposition, and stop heating immediately if the colour starts to blacken. Always use test tube holder while heating the test tube. 4. If over-heated, toxic or corrosive fumes may be evolved. The scalar hydration type is represented by the HYDRATE_SCALAR constant and is a very fast and efficient way to hydrate your data. If you heat it, it will lose the water. On adding water anhydrous copper sulphate changes to hydrated copper sulphate. 3. 5H2O by mass has to be calculated. Keep the mouth of the test tube away from your face and also from other classmates. The blue crystals are actually copper (ii) sulfate pentahydrate. Precautions 1.
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