Final answer:
To prepare a saturated solution of 1 kg of copper sulphate at 30°C, approximately 1.38889 kg of water would be needed, using the solubility of 72 g of CuSO4 per 100 g of water.
Step-by-step explanation:
The solubility of copper sulphate (CuSO4) at 30°C is given as 72 g per 100 g of water. To prepare a saturated solution of 1 kg (1000 g) of copper sulphate, we would need to find out how much water is required to achieve this solubility level. By setting up a proportion, we can calculate the amount of water needed using the solubility information. Since 72 g of CuSO4 dissolves in 100 g of water at 30°C, 1000 g of CuSO4 would require (100 g of water / 72 g of CuSO4) × 1000 g of CuSO4 = approximately 1388.89 g of water. To create a saturated solution at 30°C, we would need 1388.89 g (or 1.38889 kg) of water to dissolve 1 kg of copper sulphate.