CHM 142 Chapter Notes - Chapter 11: Lattice Energy, Ionic Radius, Ionic Compound
5 Aug 2013
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Solute (can be more than 1)-being dissolved in solvent. Dissolution of ionic solids in a polar solvent. Enthalpy of solution (energy change that happens during process) depends on: Energies holding solute ions in crystal lattice ( h{ion-ion}) Attractive forces holding solvent molecules together ( h{dipole- dipole}) Energy that results from interaction of solute and solvent ( h{ion- dipole}) Lattice energy (u) the energy released when one mole of the ionic compound (mx) is formed from its free ions in the gas phase. U = k(q1q2) / d: k is a proportionality constant depending on the lattice structure. For compounds with similar lattice structure (k is the same), lattice energy depends on ionic charge and ionic radius. Lattice energy (u)- energy released when crystal lattice is formed. H{ion-ion} energy required to remove ions from crystal lattice. Born-haber cycle algebraic sum of enthalpy changes associated with formation of 1 mole of ionic solid from constituent elements. Na(s) + cl2 (g) nacl (s)
