• Question: if you mixed salt, sand and water in a beaker and then you evaporated the water how would you seperate the salt and sand without them going missing?

    Asked by nrtyx to Alex, Amy, Andy, Georgia, Ollie on 14 Jun 2011.
    • Photo: Andy MacLeod

      Andy MacLeod answered on 14 Jun 2011:


      Hello nrtyx. I wouldn’t evaporate the water first.

      Salt is soluble, sand isn’t, so filter the mixture, THEN evaporate. The sand will be left in the filter, and the salt in the bowl once the water’s evaporated.

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