Anhydrous = without water of crystallisation. Eg: CuSO4
Hydrated = with water of crystallisation. Eg: CuSO4.5H2O
Water of crystallisation = water that is bound to a substance as part of a crystal.
Writted as .xH2O after the compound.
Sometimes you are asked to calculate the water of crystallisation in a compound.
1. To do this, you must first work out the mass of the original compound (eg: CuSO4)
2. Then you must work out the mass of the hydrated compound (eg: CuSO4.xH2O)
3. To work out the mass of water you subtract them:
Mass of water = Hydrated - Anhydrous
4. To work out the number of moles of water you divide the mass of water by its RMM (18)
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