SC-741
Filtration
Lower Sec Science · Secondary 1 · Hard · Filtration
A mixture of sand and copper(II) sulfate crystals is given. The copper(II) sulfate is soluble in water but sand is not. Which sequence of separation steps will best obtain pure copper(II) sulfate crystals from the mixture?
- Dissolve in water, filter, then evaporate the filtrate to form crystals on cooling.
- Heat the dry mixture strongly until only copper(II) sulfate remains.
- Filter the dry mixture, then evaporate the sand to leave copper(II) sulfate.
- Use chromatography on the dry mixture, then filter off the crystals.
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