CHM 11200 Lecture Notes - Lecture 6: Molar Concentration
8 Feb 2017
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Document Summary
Water and ethanol form hydrogen bonds with themselves and with each other. Make equivalent h-bonds and dispersion forces in solution. Vitamin a: very nonpolar, all carbon basically. Vitamin c: very polar, lots of oh groups. Hydrophilic: vitamin b, vitamin c, water soluble, non-polar molecules. Parts per million = (mass of component)/(mass of solution)*10^6. Physical properties of solutions different than those of pure solvents. Osmotic pressure: depend on concentration of solute particles in solution- not on identity of solute. Vapor pressure decreases when nonvolatile solute is added. Solute particles have intermolecular forces with solvent, making solvent molecules less likely to leave solution. Vapor pressure of solution always lower than vapor pressure of pure solvent (at sam e temperature) Addition of nonvolatile solute lowers vapor pressure of solution. Normal boiling point of pure liquid is temperature at which vapor pressure equals 1 atm. At that temperature vapor pressure of solution is still less than 1 atm.
