Chapter_13_Properties_of_Solutions[1]

Chapter_13_Properties_of_Solutions[1] - Chapter 13...

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Chapter 13 Properties of Solutions Homogeneous mixtures are called solutions Examples of solutions would be: - Air - Brass – a combination of zinc mixed into copper - Bodily fluids Solutions may be gases, liquids or solids - They are composed of two components - Solvent – component normally present in the greatest amount - Solute- the other component(s) in a solution 13.1 The Solution Process -Solution is formed when one substance disperses uniformly throughout another The intermolecular forces involved would be: - Ion-Dipole forces which dominate solutions in ionic substances in water - Dispersion forces dominate when a nonpolar substance dissolves in another nonpolar. For example, C 6 H 14 (Hexane) in CCl 4 - Solutions form when the attractive forces between the solute and solvent particles are comparable in magnitude with those that exist between the solute particles themselves or between the solvent particles themselves. - Solvation – once the ionic compound crystals are separated, they are surrounded by the solvent - Hydration – when the solvent is water Energy Changes and Solution Formation H soln = H 1 + H 2 + H 3
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The first energy change corresponds with the separation of solute molecules The second energy change corresponds to the separation of the solvent molecules The third change corresponds to the formation of solute-solvent interactions When we talk of Solution Formation, we can look at the disorder of the system. -Two nonpolar solutions can mix in any proportion - Processes in which the energy content of the system decreases tends to occur spontaneously -
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