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Unformatted text preview: The Dissolution Process Spontaneity of the dissolution process Reactions that involve oxidation state changes are usually considered as chemical reactions and not as dissolution Ease of dissolution depends on: The change in energy The change in disorder (entropy change) The process of dissolution is favored by: A decrease in the energy of the systems .exothermic process An increase in the disorder of a system Heat of solution is the energy change that accompanies a dissolution process Weak solute-solute attraction favor solubility Weak solvent-solvent attraction favor solubility Strong solvent-solute attraction favor solubility Negative heat of solution means exothermic Positive heat of solution means endothermic Dissolution of Solids in Liquids Crystal lattice energy is the energy change accompanying the formation of one mole of formula units in the crystalline state from constituent particles in the gaseous state M + (g) + X- (g) MX (s) + energy Solvation is when the solvent molecules surround and interact with solute ions or molecules Hydration is when the solvent is water Hydration energy is the energy change involved in the (exothermic) hydration of one mole of gaseous ion Heat of solution = heat of solvation - crystal lattice energy Like dissolved like means that polar solvent dissolves ionic and polar molecular solutes, and nonpolar solvents dissolve nonpolar molecular solutes Dissolution of Liquids in Liquids (Miscibility) Miscibility is the ability of one liquid to dissolve in another....
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