Error in Calculation of EDissolution?

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The calculation of Edissolution resulted in a negative value, despite the wet lab indicating an endothermic reaction through a temperature drop. The equation used was ∆Edissolution = Ccup∆Tcup/mass of salt. The discussion raises questions about interpreting the negative sign and its implications for classifying the reaction as endothermic or exothermic. Participants are asked to provide their calculations and insights on the nature of endothermic and exothermic reactions. Clarification on these points is essential for understanding the discrepancy in results.
Aileen Gordola
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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?
 
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Aileen Gordola said:
I calculated the Edissolution of a reaction and resulted in a negative number.
Can you show us this calculation, please?
Aileen Gordola said:
wether the reaction is endothermic or exothermic?
What do you know about endothermic and exothermic reactions?
 
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