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Calculating the percentage of silica

  1. Jul 26, 2012 #1
    1. The problem statement, all variables and given/known data
    A partially dried clay mineral contains 8% of water, the original sample contained 12% water and 45% silica. Then, the percentage of silica in the partially dried sample is nearly?


    2. Relevant equations
    Don't know if this is would help in the calculation,
    in the original sample, 12% water is present, hence non water components are consisting of 88%


    3. The attempt at a solution
    Attempted one but was out of range of the concept to be used.
     
  2. jcsd
  3. Jul 26, 2012 #2

    tiny-tim

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    hi xiphoid! :smile:

    hint: suppose the original sample was 100 g (12 g water, 45 g silica, 43 g other stuff) :wink:
     
  4. Jul 27, 2012 #3
    I had that stuff in my mind but couldn't manage to calculate further
     
  5. Jul 27, 2012 #4

    tiny-tim

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    ok, after the sample has dried, the water is less but everything else is the same

    so call it x g water, 45 g silica, 43 g other stuff, …

    from the question, what equation can you find for x ? :wink:
     
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