A student wants to obtain solid sodium chloride from rock salt, which contains insoluble impurities. She dissolves the rock salt in water, filters the mixture, then heats the filtrate. Which two separation techniques has she used?

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Question

A student wants to obtain solid sodium chloride from rock salt, which contains insoluble impurities. She dissolves the rock salt in water, filters the mixture, then heats the filtrate. Which two separation techniques has she used?

Accepted Answer

filtration and crystallisation — Award 1 mark for recognizing that filtration removes insoluble impurities and heating the filtrate to obtain solid is crystallisation (or evaporation to dryness). A is incorrect — distillation would collect the water, not the salt. C is incorrect — chromatography is not used, and the first step was filtration. D is incorrect — filtration was used first, not distillation.

Answer

distillation and evaporation

Answer

filtration and crystallisation

Answer

filtration and distillation

Answer

crystallisation and chromatography

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