SC-841
Evaporation and crystallisation
Lower Sec Science · Secondary 1 · Hard · Evaporation and crystallisation
A student has a mixture of small salt crystals and larger crystals of potassium nitrate. Both solids are soluble in water, but potassium nitrate is more soluble than salt at high temperatures.
Which method can be used to separate the two solids using this difference?
Which method can be used to separate the two solids using this difference?
- Dissolve in hot water, filter, then cool to crystallise one solid
- Use a magnet to remove potassium nitrate
- Filter the dry mixture without adding water
- Distil the dry mixture to separate the solids
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