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1、第七章思考题与习题Theseventhchapterisaquestionofthinkingandproblemsets.Withpersistenee,Ionelinesscanbeinterpretedasarowofgeese・Withpersistence,joycanblossomintoafullcircleofflowers.What'sthedifferencebetweentheconditionalandthestandardpotential?Whataretheexternalfa
2、ctorsthataffectpotential?Answer:thestandardelectrodepotentialEJreferstoinacertaintemperature(usually25°C)undertheconditionofhalfreactionofeachmaterialinthestandardstate,namely,theconcentrationoftheionsandmolecules(strictlyspeakingshouldbeactivity)is1mol/1(
3、ortheratioof1)(ifthereisgasinthereaction,thepartialpressureisequalto1.013x105pa,solidmatteractivityto1)relativetothestandardelectrodepotentialofhydrogenelectrode・Electricityontheconditionofelectrodepotential(EOf)iswhenhalfthereactiontypeoxidationandreduced
4、theconcentrationof1orconcentrationthanfor,andothercomponentsinthesolutionconcentrationhavebeenknown,theelectricitytorelativetothestandardhydrogenelectrodepotential(andcorrectionofvariousexternalfactorsinfluencetheactualelectrodepotential,itisaconstantincon
5、ditionofthesame)・Itisclearthattheconditionalpotentialisacorrectionoftheoutsideinfluences.Thestandardelectrodepotentialdoesnotcorrectvariousexternalfactors.Therearethreeaspectsofexternalfactorsthataffectthepotentialofthecondition.(1)coordinationeffect;(2)pr
6、ecipitationeffect;(3)theacidconcentration・Istheequilibriumconstantlargeoxidationreductionreactionappliedtooxidationreduction?Why?A:generallyspeaking,thestandardpotentialoftwoelectricpairsisgreaterthan0.4V(K>106),whichcanbeusedfortitrationanalysis・Infact,wh
7、enexternalconditionschange(suchasconcentrationofmedium,acidity,etc・)change,electricitytothestandardpotentialistochange,therefore,aslongasyoucantocreateasuitableexternalconditions,makethetwoelectricitytotheelectrodepotentialofmorethan0.4V,thentheREDOXreacti
8、oncanalsobeappliedinthetitrimetricanalysis・Butit'snottheequilibriumconstantthattheoxidationreductionreactioncanbeappliedtotheREDOXtitration・Becausesomeofthereactionsareverylarge,butthey'retoos1ow,andthey'reno
