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I need help interpreting my results for a thermal decomposition lab

  1. Oct 15, 2013 #1
    1. The problem statement, all variables and given/known data
    I performed an experiment recently, which required me to heat a flask and an unknown compound to constant weight. The unknown was supposed to be a mixture of calcium sulfate dihydrate and NaCl. My goal for this lab was to determine the % NaCl in the mixture. My percent error wasn't too bad: I got 12%. I'm just curious as to what could have contributed to this, especially since this error was consistent among the rest of my lab group. (Note: I was sure to completely transfer all of my compound to my flask). Does it have anything to do with the hydrate not being completely driven off?


    2. Relevant equations
    N/A

    3. The attempt at a solution
    N/A
     
  2. jcsd
  3. Oct 16, 2013 #2

    Borek

    User Avatar

    Staff: Mentor

    Composition of hydrates is often only approximate and depends on the temperature, humidity and sample history.
     
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