Making soluble salts (except sodium, potassium and ammonium salts)
1 mark · EasyState why crystallisation is used instead of evaporation to dryness when preparing hydrated salts.
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Crystallisation allows water of crystallisation to be included, forming hydrated salt crystals.
Also accept: Evaporation to dryness removes all water, so no hydrated crystals are formed.
Common mistakes: Not mentioning water of crystallisation.
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Marking points
B1 · 1 mark · States that crystallisation is needed to include water of crystallisation in hydrated salt.
Worked solution
Crystallisation traps water in the lattice, creating hydrated salt crystals.