An insulated calorimeter contains 100 g of water at 10 °C. A salt is added to the solution, causing the temperature to drop by 3 °C. Is the heat of solution for the salt endothermic or exothermic?
Exothermic reactions give off heat and cause surrounding objects to get hotter. If this was endothermic the solution would have gotten hotter because it is taking in heat.
