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Error in Calculation of EDissolution?

  1. Feb 10, 2015 #1
    I calculated the Edissolution of a reaction and resulted in a negative number. However, during the wet lab the reaction was clearly endothermic since there was a drop in temperature. I used the equation:

    ∆Edissolution = Ccup∆Tcup/mass of salt

    What is the reason for the negative number? Would i consider the negative sign as a mere drop in temperature and not as a factor contributing as to wether the reaction is endothermic or exothermic?
  2. jcsd
  3. Feb 10, 2015 #2


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    Can you show us this calculation, please?
    What do you know about endothermic and exothermic reactions?
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