CHE 2B Study Guide - Midterm Guide: Solvation Shell, Lattice Energy, Triple Point
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CHE 2B Full Course Notes
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Midterm 2 material: examples of heats of solution, nano3, nacl. H sol > 0 then solution gets cold: despite endothermicity (enthalpy), these salts dissolve spontaneously. The dissolution of salts has a higher entropy increase to offset the positive endothermicity: entropy also plays a major factor in solution, the net entropy of a process increases (2nd law of thermodynamics) **note: net entropy is different than the entropy in just a system: disorder is favored, in general i. i. P2 = vp of solvent with solute b. P pure compound > p solvent: solute- Vp is lowered by solute: causes ordering, solvation shell is produced, solvent molecules are attracted, making it harder to escape solution, effects: i. ii. iii. iv. Osmotic pressure (important if talking about living systems: vp lowering- A = mole fraction of a: raoult"s law: 2 component system, vp only.
