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in a sugar solution, the solubility increases when you apply heat to it. But why?
"1.that reaction is endothermic, so you accelerate it giving heat, and solubility increases, increasing the temperature;"ammonium nitrate disolves endothermically in water but the solubillity still rises with temperature so that can't be the reason.
"2.every reaction's speed increases with temperature, because particles move faster."All reactions, including thr reprecipitation of the sugar from the solution so that's not really a reason.
The reason is to do with entropy. The solution has less order than the nice organised crystals. Disolving is favoured by this increase in entropy but the problem is that it needs energy to do it. Heating the solution provide that energy and therfore lets more sugar dissolve.