lecture 01_21_10

lecture 01_21_10 - 01-21-10 Today Concentration units...

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1 01-21-10 Today Concentration units Colligative properties Enthalpy of solution, saturation, and solubility. Tuesday (01-26-10) Midterm Exam I on Chapter 7 and 12 Material Announcements My Office hours (room 161): Today (12-1 pm), Fri (1-2pm) Chat room: Saturday, 2-3 pm
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2 Dissolution of an Ionic Solid: NaCl Steps: • Disassembly of lattice of Na + and Cl¯ ions • Solvation of ions by water molecules (Solvation/ Hydration) NaCl (s) + H 2 O (l) Æ Na + (aq) + Cl - (aq) + H 2 O (l) C 6 H 12 O 6 (l) + H 2 O (l) Æ C 6 H 12 O 6 (solv) + H 2 O (l) Dissolution of a Molecular Solid Steps: • Breaking of glucose-glucose interactions Solvation of glucose molecules Energetics (DEMO LiCl (exothermic, NH 4 Cl (endothermic)
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3 Molality m [mol/kg] = moles of solute/mass of SOLVENT Mole Fraction X c [ ] = moles of component/total moles (solvent + solute) Molarity M [mol/L] = moles of solute/volume of SOLUTION Measures of Concentration Characteristic for NUMBER of particles dissolved Mass percentage composition % = (mass of component/total mass) x 100
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This note was uploaded on 02/16/2010 for the course CHEM 35991 taught by Professor Osterloh during the Spring '10 term at UC Davis.

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lecture 01_21_10 - 01-21-10 Today Concentration units...

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