资源描述：
《distillation - christopher king：蒸馏-克里斯托弗王》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。
1、SimpleandFractionalDistillation,andGCAnalysisName:Date:Deskno.:Partner:PhysicalPropertiesMM,g/mold,g/mLmp.,°Cbp.,°CCommentscyclohexanetolueneObservationsDistillationresults:DistillationTemperature/°Cvs.Volume/dropsdropsSimpleFractionaldropsSimpleFractionald
2、ropsSimpleFractionaldropsSimpleFractionaldropsSimpleFractional1152943572 163044583 173145594 183246605 193347616 2034486272135496382236506492337516510243852661125395367122640546813274155691428425670QUESTIONS(Nearlyallanswerscanbefoundinthe1st6pagesofch
3、apter5)1.Acertainliquidboilsatconstanttemperature,forexample127°C.Basedonthisboilingpointalone,isthisapureliquidornot?Explain.2.Explainwhyapackedfractionatingcolumnismoreefficientthananunpackedone.3.Whatistheeffectontheboilingpointofasolvent(e.g.,water)prod
4、ucedbyasolublenonvolatilesubstance,suchassodiumchloride?Whatistheeffectofaninsolublesubstance,suchassandorcharcoal?Whatisthetemperatureofthevaporabovethesetwoboilingsolutions?4.Whyisitextremelydangeroustoattempttocarryoutadistillationinacompletelyclosedappa
5、ratus(onewithnoventtotheatmosphere)?5.Whateffectdoesthereductionofatmosphericpressurehaveontheboilingpoint?Cancyclohexaneandtoluenebeseparatediftheexternalpressureis350mmHginsteadof760mmHg?Procedures:Inthetextbook,pp.89-90.2.(A)SimpleDistillationofaCyclohex
6、ane-TolueneMixture3.(B)FractionalDistillationofaCyclohexane-TolueneMixtureChangesandNotes:General:Boilingchipsareonthecentertables.MostoftheVitonconnectorsweusearewhitish,notblack.Apictureofaclaisenheadisgivenonp.10,itemj.Toheattheassembledapparatus,useasan
7、dbathinacrystallizationdishplacedonthehotplate.Thesandonlyneedstobe1/4”to3/8”(5-8mm)deep;iftoomuchsandisused,youhavetowaitforittowarmup.Ahotplatesettingof6or7willprobablydothejob.gcanalysis:Sampleswillbeanalyzedbygaschromatography(gc).Obtainsixvialsandlidsf
8、romthecartatthefrontofthelab.Collectthefirst5dropsofthedistillationinonevial,thencapit.Collecttherestofthedistillationinasecondvial.Lettheapparatuscool,thentransfertheundistilledliquidintoathirdvial,an
