CHEM 001B Lecture Notes - Lecture 15: Lattice Energy, Ionic Compound, Intermolecular Force

• School: UC Riverside
• Department: Chemistry
• Course: CHEM 001B
• Professor: Quan Cheng

Document Summary

Dissolution of ionic solid: e(cid:374)thalp(cid:455) of solutio(cid:374) (cid:894) hsoln) depends on, energies holding the solute ions in crystal lattice, attractive force holding solvent molecules together. Interactions between solute ions and solvent molecules: hsoln = hion-ion + hdipole-dipole + hion-dipole, when solvent is water, hwater = hion-ion + hhydration. Born-haber cycle: series of steps with (cid:272)orrespo(cid:374)di(cid:374)g hs that des(cid:272)ri(cid:271)e the for(cid:373)atio(cid:374) of a(cid:374) io(cid:374)i(cid:272) solid from it elements, e. g. na(s) +1/2cl2(g) nacl(cid:894)s(cid:895) hf =-411. 2 kj, steps, 1. Sublimation of 1 mol na(s) na(cid:894)g(cid:895) = hsub: 2. Breaking bonds of mol of cl2 = hbe: 3. Ionization of 1 mol na(g) = ie1: (cid:1008). Io(cid:374)izatio(cid:374) of 1 (cid:373)ol cl(cid:894)g(cid:895) = : (cid:1009). Vapor pressure of solutions: pressure exerted by a gas in equilibrium with liquid, rates of evaporation and condensation are equal. Factors affecting vapor pressure: temperature, as t increases, ke increases, vapor pressure increases.