分析化学B卷英文.docx
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分析化学B卷英文.docx
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分析化学B卷英文
学院 系 班级 学号 姓名
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扬州大学试题纸
(2006 -2007学年第一学期)
化学化工学院化学06年级课程AnalyticalChemistry(考试)B卷
题目
一
二
三
四
五
六
七
八
总分
得分
I.Singlechoice(2pointsperquestion,30%)
1.Whatisthestandarddeviationvalueforthedatasetlistedbelow:
1.1668,1.1559,1.1833,1.1622,1.1713,1.1699,1.1655;
A.0.0085B.0.0079C.0.0274D.0.0188E.noneofthese
2.Whatisthegravimetricfactorforthedeterminationofthew/w%MgwhenprecipitatedasMg2P2O3?
Atwts:
Mg=24.305g,P=30.974gO=15.999g
A.0.30658B.3.26178C.0.15329D.6.52355
E.noneofthese
3.Ifthetruevalueofameasurementdoesnotfallwithintheconfidencelimitsthistellsus:
()
A)nothing
B)thatourmeasurementisnotprecise
C)thatourmeasurementisneitheraccuratenorprecise
D)thatourmeasurementisnotaccurate
E)thatourtruevalueiswrong
4.AliterofCuCl2-watersolutionwhichcontains1.0mgofCuCl2
hasaconcentrationofCuCl2.
A.1.0ppbB.1.0ppmC.1.0pptD.noneofthese
5.ofaabsorbingcomplexisalwaysdependentuponthe_____
A.thestabilityofthecomplex
B.thethicknessofthecontainer
C.thewavelengthoftheelectromagneticradiation
D.theconcentrationofthecomples
6.Thebestwaytoremoveimpuritiesresultingfromthemechanicalentrapmentandocclusionisto__________theprecipitate.()
A.peptidizeB.reprecipitateC.digest
D.washE.noneofthese
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7.TheequilibriumconstantforthereactionofMnO4-andFe2+is______
(E0(MnO4-/Mn2+)=1.51V;E0(Fe3+/Fe2+)=0.77V)
A.320B3.41012C5.21062D4.81063
8.Youaretitratingaweakbase,CH3NH2,with0.05000MHCl.Ifyoustartwith25.00mLof0.1000Mbase,whatwillbethebestindicator(pickfromthoselistedbelow)todetecttheendpoint?
Kb=4.3510-4
IndicatorpKa
A.BromocresolGreen4.66
B.BromocresolPurple6.12
C.PhenolRed7.81
D.Phenolphthalein9.4
E.Noneofthese
9.AseriesofsolutionscontainingNaOH,Na2CO3,andNaHCO3aloneorincompatiblecombination,wastitratedwithHCl.ThevolumeofHClneededtotitratethesolutiontoaphenolphthaleinendpointisV1mL.ContinuingtotitratethesolutiontoabromocresolgreenendpointneededV2mL.If2V1=V2,thecomponentofthemixtureis_____________
A、NaOH+Na2CO3B、Na2CO3+NaHCO3
C、NaOH+NaHCO3D、NaOH+Na2CO3+NaHCO3
10.TheendpointindicatorusedintheFajan’sMethodisfluoroscein.Itisan____indicator().
A.acid-baseB.adsorptionC.complexometricD.noneofthese
11.Theformationequilibriumconstant,KMY,forthereaction:
Pb2++EDTA4-<==>PbEDTA2-is1.11018.IfthetitrationisdoneatpH=6.0(4=4.55104),whatistheconditionalformationconstant,KMY’,forthereaction.
A.1.11018B.2.41013C.2.210-5D.4.91023
E.noneofthese
12.Foranelectrochemicalcell,Eanode=0.287VandEcathode=0.698V.Whatisthecellvoltageforthissystem?
A.0.698VB.0.287VC.0.411VD.-0.411V
E.noneofthese
13.TheLambert-Beer’sLawstatesthattheabsorbanceisproportionaltotheconcentrationoftheanalytemeasured.Whichoneofthefollowingconditionsmustbefulfilledwhenmakingacalibrationplotforagivenanalytespecies?
A.Thewavelengthmustbefixed.
B.Thelengthofthelightpaththroughthesamplecell(cuvet)mustbefixed.
C.Bothoftheconditionsstatedina)andb)mustbefulfilledsimultaneously.
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D.Thelengthofthesamplecell(cuvet)mustbeaffixed,butthewavelengthcanbevariedatwill.
14.The%Tofapotassiumpermanganatesolution,measuredat525nmina1mmpathlengthcuvetis54%.Ifthesolutionisdilutedbyafactoroffiveandplacedina5mmpathelengthcuvet,theabsorbanceis:
a)cannotdetermine-notenoughinformationprovided
b)0.055c)0.268d)4.6e)54
15.Whenacoagulatedcolloidalprecipitateisre-dispersedduringthewashingstep,thisprocessisknownas_____()
A.digestionB.reprecipitationC.occlusion
D.peptidizationE.noneofthese
IIFillintheblankswiththerightanswers(2pointsperquestion,20%)
1.Toseetheacidcolorofanindicatorusedinanacid-basetitration,[Hin]/[In-]mustbe__________。
2.Pleasewritedownthemass-balanceequationof0.1mol.L-1H3PO4
aqueoussolution__________________________________________.
3.Accordingtotherulesofsignificantfigures,howmanysignificantfiguresareincludedinthefollowingexamples?
______________;pH=0.03________.
4.TheprimarystandardsforthestandardizationofHClare________and_______,forthestandardizationofNaOHis________and___________.
5.AccordingtoBronsted-Lowryconcept,theconjugatebaseofNH3+CH2COOHis_______________,andtheconjugateacidofOH-is____________
6.Toobtainasolutionhavinganalyticallyusefulconcentrationofiodine,iodineshouldbedissolvedinmoderatelyconcentratedsolutionofpotassiumiodine,thereasonis___________________________.
7.Thewavenumberofabeamofinfraredradiationwithawavelengthof5.00mis_______________
8.ThepHofanaceticacidsolution(HC2H3O2)withCm=0.100M,Ka=1.7510-5is_________.
9.WhenthemixedsolutioncontainingBa2+,SO42-,FeCl4-,PtCl62-andCa2+passedthroughtheanionion-exchangeresins,_______________wereheldbytheresins.
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10.Duringthecomplextitration,KMY’_____________(decrease,increaseornotchange)withthedecreaseofpH.Consequently,thechangeinp-functionobservedintheequivalenceregionis_________(larger,smallerornotchange).
IIIEssayquestions(4pointsperquestion,20%)
1.Pleasedescribethedifferenceandrelationshipbetweenthedistributioncoefficientanddistributionratio.
2.Whataretherequirementsforanindicatorforaprecipitationtitration?
3.Asolutioncontaining4.48ppmKMnO4hasatransmittanceof0.309ina1.0-cmcellat520nm.CalculatethemolarabsorptivityofKMnO4.
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4.Forthesetofthereplicatemeasurements,0.0902,0.0884,0.0886,0.1000,theacceptedvalueis0.0930.Forthemeanofthesetofdata,calculatethe(a)absoluteerror;and(b)therelativeerrorinpartsperthousand.
5.CalculatethepHofasolutionthatis0.200MinNH3and0.300MinNH4Cl.(TheaciddissociationconstantKaforNH4+is5.7010-10).
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IIIProblems(10pointsperquestion)
1.Calculatethehydroniumionconcentrationforabuffersolutionthatis2.00Minphosphoricacidand1.50Minpotassiumdihydrogenphosphate.(Forphosphoricacid,Ka1=7.1110-3,Ka2=6.3410-8)
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2.CalculatetheconditionalpotentialofZn2+/ZnatpH=10.00.020mol/LNH3-NH4Clbuffersolution.(ignoretheeffectofionicstrength)KbNH3=1.8×10-5;Zn-NH3:
lg1-4=2.37,4.81,7.31,9.46;
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3.CalculatetheconcentrationofNi2+inasolutionthatwaspreparedbymixing50.0mLof0.0300MNi2+with50.0mLof0.0500MEDTA.ThemixturewasbufferedtoapH0f3.00.ThevaluesforthedissociationconstantsofH4Y,K1=1.0210-2;K2=2.1410-3;K3=6.9210-7;K4=5.5010-11.KNiY=4.21018
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