Final answer:
To make copper sulphate crystals containing water of crystallisation, you need to add water to anhydrous copper(II) sulphate crystals through a process called hydration.
Step-by-step explanation:
When anhydrous copper(II) sulphate crystals are made into copper sulphate crystals containing water of crystallisation, it means that water is added to the anhydrous copper(II) sulphate crystals to form a hydrated compound. This process is known as hydration. Here are the steps:
- Weigh a known mass of anhydrous copper(II) sulphate crystals.
- Add a small amount of water to the crystals and mix them well.
- Continue adding water in small increments and mixing until the crystals no longer absorb any more water.
- Weigh the resulting copper sulphate crystals containing water of crystallisation.
The difference in mass between the initial anhydrous crystals and the final hydrated crystals represents the mass of water that was added.