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Ch_322a_2.013 - Solubilities The solubility of a solute in...

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Solubilities The solubility of a solute in a solvent depends on intermolecular forces in the solute, solvent and solution. The solubility increases as the solute - solvent interactions increase in strength relative to the solute-solute and solvent-solvent interactions. solute + solvent solute in solvent (solution)
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Ionic Solids There are very strong interionic attractive forces in ionic solids (lattice energy). Ionic solids dissolve in water and a few other highly polar solvents where strong solute-solvent interactions compensate for the lost solute-solute and solvent-solvent (hydrogen bonding) interactions . Na + Cl - solid solute strong interionic forces + H 2 O solvent strong intermolecular forces Na + aq + Cl - aq solution strong solute-solvent interactions Ionic solids do not dissolve in nonpolar solvents where the solute-solvent interactions are weak.
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Sodium Chloride in Water NaCl solid ionic lattice structure strong interionic forces potential energy NaCl solid + - - - - + + + + - - + + - - - - + + + + - - + + - dissociated ions + - (no solvation) water O H H O H H O H H O H H O H H O H H O H H O H H O H H + - solvated ions solvated ions
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