10-9-08[lecture11]jr

10-9-08[lecture11]jr - CHEM 116 Lecture 11 Notes 10-9-0-8...

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CHEM 116 Lecture 11 Notes 10-9-0-8 (JR) Pressure: force per unit area In diagram, Osmosis is the higher concentration moving into the concentration of the lower concentration. Since there is a barrier, the concentration cannot move through it, so the smaller water molecules do (in the opposite direction to make the higher concentration in equilibrium with the lower one). Osmotic pressure: pv=nRT o n/v: molarity o p: osmotic pressure In ideal solutes: o Ionic compounds dissolve completely in water, and molecular compounds do not break up. o The van’t Hoff factor for molecular compounds = 1 (only one molecular compound that stays as one) o The van’t Hoff factor for an ionic solute equals number of ions that an ionic unit breaks into. In non-ideal solutes: o Some ionic compounds only partially dissociate in water, and molecular compounds can dissociate a little bit (example: organic acids where a small fraction of the H + ions break off).
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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10-9-08[lecture11]jr - CHEM 116 Lecture 11 Notes 10-9-0-8...

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