Class Note for CHEM 112 at UMass(9)
Class Note for CHEM 112 at UMass(9)
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This 8 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 14 views.
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Date Created: 02/06/15
Concentration Calculations Dissolve 621 g 100 mol of ethylene glycol in 250 g of H20 Calculate weight of glycol De nitions Solutions can be classified as saturated or unsaturated A saturated solution contains the maximum quantity of solute that dissolves at that temperature De nitions SUPERSATU RATED SOLUTIONS contain more than is possible and are unstable Dissolving a solute miscible vs immiscible Nonpolar I2 Polar H20 Pom H20 Shake the test tube Nonpolal39 NonpoLar CClA 39 CCl4 and 12 WWWMW Like dissolves like and solubility is based on lMFs DissolVing An Ionic Solid Dipoiempole Attvac on and hydrogen bonding 5 r Ionrdipnle attraction de ned by enthalpy uf I hymn Mum Na Lu Cl Innion attractiun de ned by the lattice enthalpy AHW Calculating the Heat of Solution KqF9 AH flaktice enthalpy Mum z 7337 mm AN 521 Klmnl ENEREV KF5 715 kJml Wan an Calculating the Heat of Solution K quWg AH flat ce enthalpy 7 AH 437 m l AN 521 lamnl Mmquot m E Table 141 Data far almlalinq Euthale afSnlution 75 Mfaq 1 ml ompnund kJmnl Idmm Ms M ruiaw rail 15 W rmr m 5723 mag mag Kl 5m 5350 w w 7W a mi ma 7 AHsoln AHfproducts AHf reactants 1le in mi w 7W 7401 W m 7W 7m 355 b 337 a Enthalpy of Solut1on One application of a enthalpy of solution is the ammonium nitrate cold pack Ammonium nitrate has an ENDOTHERMIC heat of solution it requires heat to dissolve the solid AHsoln 257kJmo Supersaturated Sodium Acetate Sodium acetate has an ENDOTHERMIC heat of solution NaCH3CO2 s heat gt Naaq CH3COZ39aq Therefore formation of solid sodium acetate from its ions is EXOTHERMIC Naaq CH3COZ39aq gt NaCH3CO2 s heat Supersaturated sodium acetate produces heat when the ions come out of solution and form a solid Supersaturated Sodium Acetate One application of a supersaturated solution is the sodium acetate heat packquot Sodium acetate has an ENDOTHERMIC heat of solution it requires heat to dissolve the solid AHsoln kJmol Sodium acetate has an EXOTHERMIC heat of fusion it produces heat as the solid forms AHfusion kJmol 10 Effect of Temperature on Solubility of a Solute in a Solvent Endothermic reactions Solubility with temperature Exothermic reactions Solubilitywithtem peratu re 11 Dissolving Gases amp Henry 5 Law kH for 02 166 x 10396 M mmH When Pgas drops solubility drops 12 Scuba Diving DIVE TABLES anEI ENDGHIWEWEH mow Hyperbaric Treatment ns Treated by HBOZ Therapy ondmnnsan n matcde nwz Theravy Cnmvmmued cm and new mm a a mum wound mm Vnadmuaxe mam aw DxabeM Wound of Lamr Extremm mmmng wounds mmvkazed by mummy mm at mama cmmc Maury mecmy ms mm mfmmn that has m rammed m the w man nf surgery and swam Ramanan man r Ramatmn mm pmmmmnm ummg bleedng nr Dam Oxtwradmnxmsu 7 Non nealmg 5m ulcer campmmm surgvcalwoundman 1mm area carbnn Manama Pmmnmg Gas Gangrene mm mm W Ymumauc Penvneral Knerma Naman mam Mute Penvheral mm mmmem mu mmmnns may am be nanum H802 Therapy Momvremon vllnexx gasembnhxm yanme Effect of Temperature on Solubility of a Gas For all gases solubilityl with T temperature This is due to gases dissolve by exothermic process 15
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