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Method to distinguish SiO2 and CaCO3

  1. Sep 8, 2015 #1
    1. The problem statement, all variables and given/known data
    image.jpg
    I chose D, because since SiO2 is an acidic oxide whereas CaCO3 is neutral. But the correct answer is C. And i have doubts on option A and B too.. I can't seem to see why are they not right.. For A, I thought a neutralisarion reaction will happen with SiO2? And for B, I thought CaCO3 decomposes? Please help, thanks
     
  2. jcsd
  3. Sep 8, 2015 #2

    Borek

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    Staff: Mentor

    Have you ever tried to dissolve SiO2 in a base? Have you ever tried to dissolve it in water?

    Roasting and gentle heating are two different things.
     
  4. Sep 9, 2015 #3
    No, I haven't..

    I see, so if we were to gentle heat them, do they melt?
     
  5. Sep 9, 2015 #4

    Borek

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    Staff: Mentor

    That was a rhetoric question. You are expected to know some basic properties of the substances from the curriculum.

    Check melting points in wikipedia. Actually the best thing you can do is to read about properties of both compounds in some textbook.
     
  6. Sep 9, 2015 #5
    Ok thanks
     
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