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1、络合滴定练习题（Complexometrictitrationexercises）ComplexometrictitrationexercisesFirst,themultiple-choicequestion1.Fe3+andAl3+havechromiumblackTwith()A.;ossification;B.oxidation;C.precipitation;D.closure2.inthemixtureofCa2+andMg2+,theEDTAmethodforthedeterminationofwhenCa2+,theeasiestwaytoeliminateinterfer
2、enceis(Mg2+).A.controlledaciditymethod,B.coordinatemaskingmethod,C.redoxmaskingmethod,D.precipitationmaskingmethodWhen3.EDTAischelatedwithmetalions,itscomplexingratioisgenerallyA.1:1B.1:2C.1:4D.1:64.withEDTAtitrationofmetalions,inordertoachieveerrorlessthan0.2%,shouldmeettheconditionsA.C->10-8B.C-
3、>10-8C.C=106D.C=1065.whenwetitrateZn2+withEDTA,wecallthisbecause(that)theabilityofNH3+EDTAtoreactwithZn2isreducedbecauseoftheadditionofammoniabuffersolutiontotheactionofZn2+.A.acideffect,B.coordinationeffect,C.hydrolysiseffect,D.interferenceeffectA,largeatomicradius,B,lanthanidecontractioneffectC,
4、stronghydrolysis,D.,inertelectronpaireffect6.thefollowingstatementisnotcorrectas()A.EDTAisabidentateligandwithsixteethInadditiontoIA,EDTAandmetalionscanformstablecomplexesingeneralB.ThecomplexesofC.EDTAwithmetalionsareusuallycharged,sotheyaresolubleinwaterD.withoutconsideringthehydrolysiseffect,th
5、estabilityofEDTAandmetalcomplexesisnotaffectedbytheacidityofthemedium7.whenonlyacideffectsareconsidered,therelationbetweentheconditionalstabilityconstantK'fMYandtheabsolutestabilityconstantKfMYis()A,K,fMY>KfMY,B,K,fMY=KfMY"C,LG,K",fMY,=lg,KfMY-LG,alpha,Y(H),D,LG,K,fMY,=lg,,KfMY+,LG,alpha,Y(H)8.inc
6、oordinationtitration,themorecomplexthemetalionformswiththeEDTA,thepHvalueallowedinthetitrationThehighertheB.,thelowertheA.,andtheC.neutralD.doesnot9.titrateMionsinthesameconcentrationofMandNionsin0.01molandL-1EDTAions.GiventheLG=18.6,lg=10,theappropriatepHrangefortitrationofMionsisA.,2~6,B.,3~8,C.
7、,4~8,D.,4~1010.thefollowingstatementofalphaY(H)iscorrect()A.alphaY(H)increaseswithdecreasingacidity,andB.alphaY(H)decreaseswithincreasingpHvalueC.alphaY(H)decreasedwithincreasingacidity,andD.alphaY(H)wasindepende
