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Sand can be separated from salt solution by filtration, because:
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Sand can be separated from salt solution by filtration, because:

User Paulo Janeiro
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the salt is soluble in waterwhile sand is not. After the filtration, boil the water away and get your saltback. There is no interaction between the sand particles and the watermolecules. Therefore they do not form an emulsion or colloid or solution.
User Thom
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