If we run an exothermic reaction in solution in a calorimeter, the heat produced by the reaction is trapped in the calorimeter and increases the temperature of the solution. If we run an endothermic reaction, the heat required by the reaction is removed from the solution and the temperature of the solution decreases.

Sketch of a calorimeter

We can calculate the amount of heat absorbed by the solution or the amount of heat removed from the solution with the following equation:

q equals mass times specific heat times temperature change



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