Class Note for CHEM 112 at UMass(38)
Class Note for CHEM 112 at UMass(38)
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This 10 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Massachusetts taught by a professor in Fall. Since its upload, it has received 20 views.
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Date Created: 02/06/15
Turn on Camtasia Recording SI Sessions Tuesday 715 830 pm Wednesday m5 pm SHE 44200 Room 113 WEB DuBois Library 0 35quot AH 90 The enthalpy of solution for NaOH is Negative eXo Meerio BPositivg yawf Miami nch H39ab quothealL a 3 Why does soda bubble W s H10 COLL Ragga Hem UM Gas solubil 39g u 2 Lu 3912 s k D Mum7 M W 44 Jm w k4Ll0397UX Ih 4Hw0 3 M Before 2 quot opened the selzer water the CO2 concentration was 00506 M at 25C What was the pressure of CO2 gas in the bottle in mm Hg Gas solubility in molL kH o Pgas 4 7 kH for CO2 448 x 10395 M mmHg saw of 5 in 39 1 5 0 06mm 44 Mo Gill 170 WMHj Pats 41W Effect of Temperature on Solublhtx ofma Gas oato 6 vial solVaLl quotS 9 50an wad G s V1le H FNMA0quot For all gases SolubilityJL with T temperature This is due to I Chatlier s Principle Todays take Va por Pressu re home messages Lower39ng fa Boiling Point Elevation 9 Freezing Point Depression Colligoclive Paw4quot K W m emcw hc m Wok 0K qf viE Understanding Colligative Properties VP of H20 over a solution depends on the number of H20 molecules per solute molecule Psolvent proportional to Xsolvent law 1 m l l Vquot 4 ll so w gm Vapor Pressure Lowering N aua 7 7 7 7 7 7 39 39 39 39 39 39 fr ormjl W squot 700 3 39 39h 500 1 n W E 500 i 39 l El 400 6 C i a As 1 1 Eb M W gt 300 Xsangzo JSS W 200 quot 1 1 39 sutute AL 100 BF pure 151 Ep benzene suhm39on Gan 20 40 so a 70 go Ysmpsratws c gure 14 13 Raoult s Law MW 5415 ml mosh Assume a soluti n containing670 9 sucrose CIZHZZOH in 40 g of water What is the vapor pressure of water over the solution at 80 C The VP of pure H20 is 3551 mm Hg see App 6 5139 lo I mot A Raoult39s me W dugmi m MW wt 1 4 175 Assume a soluti n containing 0 g 39 M sucrose CHI220 in 400 g of water Hap What is the vapor pressure of water over 3 the solution at 80 The VP of pure H30 is 551 mm H see App 6 S W mummy M 39 PM solved Id Wusc 103 x 0021 ml soc m 5 W H s 4oan 21nmlnpb SJ 11MNH U lo 9 wa I39m mch 21H 1 05quot 1535vnuu5 3504 Boilir u Point Change WW1 W39thAng m IEIUD I FRWh M AT 39 m 800 760 mm Hg quot K 391 Br g 600 339 5 400 0 Water in 3 Ethgiene ct gigco 200 solution I DU 10 2D 30 4D 50 60 TD 81 90100110120 Temperature C The boiling point of a solution is higher than that of the pure solvent Change in Boiling Point If we dissolve 621 g of glycol 100 mol in mof water What is the BP of the solution KBP 0512 oCmolal for water 0 00 dial 4m Midas Mg K3 K59 39 WI gt 6512 3 42051 Ws vhm 5 NB quot39 MN 50 4 105 13 Change in Freezing Point Pure water Ethylene glycolwater solution The freezing point of a solution is LOWER than that of the pure solvent 14 Lowering the Freezing Point Sum n n pumsuwent Freezing Point Depression Calculate the freezing point of a 400 molal glycolwater solution Kfp 186 OCmolal 15 Boiling Point Elevations and Freezing Point Depressions with ions i van t Hoff factor number of particles produced per formula unit Compound Theoretical Value of i Ethylene glycol 1 NaCI 2 CaCI2 3 17 Freezing Point Depression Q How much NaCI must be dissolved in 400 kg of water to lower the freezing point to 1000 C Kfp 186 Cmolal 18 Freezing Point Depression Q How much NaCI must be dissolved in 400 kg of water to lower the freezing point to 1000 C Kfp 186 Cmolal 19 Boiling amp freezing point constants Normal Boiling Normal Freezing Point C Kb Point C Kn Solvent Pure Solvent Cm Pure Solvent Cm Water 10000 05121 00 186 Benzene 8010 253 550 512 Camphor 2074 5611 17975 39 ChLomforrn CHCla 6170 363 UMa nitiative