Breaking solvent-solvent attractions and breaking solute-solute attractions : endothermic process
Forming solute-solvent attractions : exothermic process
In mixing the two solutions, it will require energy to break the attraction of each solution and create a new attraction that produces energy.
If both are equal then there will be no heat released or received so that the delta H solution is 0, which indicates that the solution is ideal
The ideal solution occurs if the attractive force between the molecules is the same as the attractive force of each solute and solvent
There are 2 kinds of deviations from Raoult's Law,
Occurs if the attractive strength between each mixture forming agent is stronger than the attractive in the mixture
(X-X, Y-Y> X-Y)
This deviation produces a positive enthalpy of solution (ΔH +) which is endothermic
Occurs if the attractive force in the mixture is stronger than the attractive force of each substance
(X-Y> X-X, Y-Y)
This deviation produces an enthalpy of a negative value solution (ΔH -) which is exothermic
So that breaking solvent attractions and breaking attraction solutes require energy so it is called an endothermic process
While forming solute-attraction attractions will release heat so-called exothermic process
Raoult's law
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Deviation from Raoult's Law
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When heat is added to a substance
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