Is the water in a crystalline sugar solution endothermic or exothermic?
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Is the water in a crystalline sugar solution endothermic or exothermic? Ask for the source
It should usually be endothermic, because crystallization from a solution is a process of entropy reduction that requires energy input from outside the system. Additionally, solvent evaporation causes the solute to precipitate, and this process itself also requires heat absorption.
Thank you very much. However, after checking some information, I found that heat is released, and quite a lot of it at that. I also conducted a simple dissolution experiment on my own, but there was no significant change in temperature
If a pure substance solidifies or crystallizes from a liquid state, it is definitely exothermic, due to the phase transition heat. However, in the case of a solution, when the solute precipitates out of the system and the proportion of solvent is reduced through solvent evaporation, heat should be absorbed. If the solubility of a solute decreases due to cooling, it is necessary to conduct a detailed analysis of the thermodynamic changes in such a situation.