Question

When would dissolution of solute in a solvent lead to the libration of energy

Answer 1

Answer:

As temperature increases, thesolubility of a solid or liquid canincrease or decrease depending on whether the dissolution reaction is exothermic or endothermic. In endothermic reactions, the net energyfrom the bonds breaking and forming results in heat energy being absorbed when the solute dissolves in solution.

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Answer 2

Dissolution happens in three steps.

Solute-solute attractions must be broken (consumes energy, endotherm), solvent-solvent attractions must be broken (also endotherm), and finally solute-solvent attractions form. This results in a lower energy state and is exotherm.

Dissolution will be endotherm if it takes more energy to break the mentioned attractions, than is released in the last step. You are asking then, why is this reaction spontaneous? In other words, why does it occur? To find out we need chemical thermodynamics.

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