CHM 113 Lecture Notes - Lecture 22: Dynamic Equilibrium, Boiling-Point Elevation, Osmotic Pressure
Document Summary
Solutions: homogeneous mixtures of two or more pure substances, solute uniformly dispersed in solvent, solvent can also be considered as the thing in greater abundance, solution formation. Solvent pulls solute particles apart and surrounds (solvates) them: energy changes. New interactions between solute and solvent: reason for endothermic processes. Increasing the disorder of a system tends to lower the energy of a a system. Overall enthalpy may increase, but overall energy of a system can still decrease: warning. A substance disappearing doesn"t mean it has dissolved, it may have just reacted. Therefore, you can get back the substance which dissolved. If you can"t get back the dissolved substance that means it reacted: types of solutions. Solvent holds as much solute as is possible at that temperature. Dissolved solute is in dynamic equilibrium with solid solute particles. Less solute than can dissolve in solvent at that temperature is dissolved in the solvent.
