Chem1330ClassNotesfor 25August2017.pdf

Chem1330ClassNotesfor 25August2017.pdf - Colligdtive...

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Unformatted text preview: Colligdtive Properties “W1 {,4 1111211 /{f" 591(- g} LLLW Paw?" (LEI) I mpg/11m «Haj My M 5248 611 “14% @1194 ”111?? “ U MU 111E135 Ci"! ‘x, U 51?L%M W Vapor Pressure Lowering 1:4: 5E §iEbbEHE IS 7%III WEI CE IIEIIESEImbLE VIEW WSSIIM) Wig/IE {It/11W 7&7wa PIEIESSIEE’E’ (SCH: W wg’bE/QEL’ " ngII/“ZIM IS (IfIIE-EEE/S (TEE/fl It” (A5?” WES Mt" [WEE Raoult’s Law PA = XAPOA K, IE :- gob/em} Where ° X A is the mole fraction of compound A, and ° P°A is the We of A at that temperature. , (I n NOTE: This is one of those times when you want to make sure you have the vapor pressure of the solvent. Er“. Example: Using Raoult’s Law to Find AP Find the vapor pressure lowering, AP, when 10.0 mL of glycerol (C3H803) is added to 500. mL of water at 50.°C. At this temperature, the vapor pressure of pure water is 92.5 torr and its density is 0.988 g/mL. The density of glycerol is1.26 g/mL. , i o z AR" Pr "" A- Opfqméi W73 ’w‘m Boiling Point Elevation and Freezing Point Depression Presence of non-volatile substance (solute) lowers the vapor pressure of a solution. Thus both the boiling point and freezing points are affected. Boiling Point Elevation 7‘ Q 739 \ L both: [iii (if {It/4 Wéaiifihj I giro-z: K 43 11% f (j 5 64W 5, my gr} um“ ( Z / M Narmai Beifing Narmai Freezing SeEvent I’aint (”{3} Kg; {”Cfm) Paint PC} K; {“ij} W’atei‘, H30 3 {X313 {3‘ ’3} {M} 3 .86 Benzene, {:5}"{6 80.1 2.53 5.5 5:12 Ethanoi, CgE‘i5iEH 373331 122 ”114.6 1,99 Carina": tetmchioride, Caz; 3’58 5.02 ~22} 29,8 383 "633 4.638 Chicamform, Ci—iCig 612 Freezing Point Depression , AM ’15 I: “Kiw- RM(%;: 7, P‘f‘ 5% GU19 K 3 MN“ PM“? 3,0“,wa ”Wife, MU ) giggfigflgg Cm qewiifiaj 6% _ ( aC/M SW lithe“ ‘ Mama} Baiiirzg Normal .¥r€ezing Sniveni Faint {°C) Kg; (”C/m} i’aini {“C} K; {QC/33?} Wa £91; 830 3133.8 {23.5} {1.8 11:86 Eenmne, (36%) $9.31 2.83 55 5.12 Ethamtal, CgfigOH 128.4 3.32 m 1 14.6 1&9 Caabmn tetrachimidC CG"; ?6C8 33.02 ~22.3 29.5 4; hiomfarm CHCig 612 35.33 “63.5 ébg ...
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