第1題Whatdoestherifflesamplerdo?ADecomposethesampleBBreakupsamplesCDividetestspecimenintoseveralspecimenwithcertainweightsforfurthertestDMixthesamples第2題Inordertodeterminesilicainlimestonesamples,howtodealwiththesample?ADissolveinhydrochloricacidBDissolveinmixedacidaquaregiaCUsesodiumcarbonateasflux,halfmeltsolutionDDissolveinsulfuricacid第1題Theadditionof()totheliquidsampleistopreventprecipitation.AH2SO4BHNO3CNaOH第2題Oilsubstancesshouldbeseparatelysampled,andcollectedwiththesurfacewater.Whenonlytheemulsificationandsolubilityofoilsubstancesinwateraremeasured,theoilfilmlayerfloatingonthewatersurfaceshouldbeavoidedandthesampleshouldbetakenbelow().A10cmB10-15cmC20-50cm第3題Recentresearchandexperimentalresultsshowthatthestabilityorderofsamplecontainermaterialisborosilicateglass>platinum>transparentquartz>polyvinylTeflon().第4題Industrialwastewateranddomesticsewageareunsteadyfluidwhoseflowandconcentrationchangewithtime.Thecollectedsamplesshouldberepresentativeandreflectthechangetomeettherequirementsoftotalvolumecontrolandconcentrationcontrol().第5題Withinaproductioncycle,samplesaresampledseveraltimesatcertainintervals,andthepHvalueisdeterminedaftermixingevenly.()第6題Thesettingprincipleofsedimentsamplingsectionisthesameas____.Asfaraspossible,thesedimentsamplingpointshouldbeonthesameverticallineas____.正確答案：:Surfacewatersamplingsection正確答案：:Thewaterqualitysamplingpoint第7題2.3Exercises第1題第2題3.1Exercises第1題Ofthefollowingstatements,theoneprovidingthebestexplanationofthesmallrandomerroris().AWithhighprecisionBItisconsistentwiththeaverageoftheresultsofsingleanalysesofsampleswithknownmassfractionCBigstandarddeviationDCarefullycalibrateweights,capacityinstruments,etc第2題Whichofthefollowingisasystematicerror().ATheindicatordiscolorationpointisnotconsistentwiththestoichiometricpointBThelastestimateofburettereadingwasinaccurateCTheweightvaluewasmisrememberedwhenweighingthesampleDThezeroofthebalancechangesslightlyduringtheweighingprocess第3題Inquantitativeanalysis,therelationshipbetweenprecisionandaccuracyis().AHighprecisionleadstohighaccuracyBHighaccuracyleadstohighprecisionCPrecisionisaprerequisiteforaccuracyDAccuracyisaprerequisiteforprecision第4題Whenmeasuringthedispersionofthesamplemean,thestatisticstobeusedare().ACoefficientofvariationBThestandarddeviationCStandarddeviationofthemeanDRangevalue第5題Thecharacteristicofrandomerrorinanalyticalmeasurementis().AThereisarangeofvaluesB

ThereisnolawtofollowCThemagnitudeerrorhasthesameprobabilityDTheprobabilityofpositiveornegativeerroristhesame第6題Themassfractionofnitrogeninacertainammoniumsaltwas5.15,5.32,5.22and5.25.Theaverageis____;Thestandarddeviation(s)is____;Thestandarddeviationofthemeanis____.正確答案：:5.24%正確答案：:0.070%正確答案：:0.035%3.2Exercises第1題ByanalyzingthepercentagecompositionofSiO2,twodatacanbeobtained:35.01%and35.42%.AccordingtotheruleofsignificantNumbers,theaveragevalueshouldbeexpressedas()A35.215％B35.22％C35.2％D35％第2題HowmanysignificantNumbersarethereasaresultofthefollowingcalculation?()

（）0.1010（25.00?24.80）1.0000AfiveBfourCthreeDtwo第3題Forthedeterminationofacertainorganicsubstance,0.2000gsamplewastakenand10.00mLof0.01000mol/LI2standardsolutionwasaddedafterdissolution.Theconsumptionof0.01000mol/LNa2S2O3was19.20mLwhendroppingbackI2,sotherelativeerrorofthedeterminationresultwasabout().A0.1%-1%B1%-10%C10%-20%D100%第4題Usingaplatformbalancewithinstrumentprecisionof0.1gtoweighsamplesofabout20g,Themaximumnumberofsignificantdigitsis____toberecorded.Iftherelativeerrorofweighingisnotmorethan2%,thesoilsampleshouldbeatleast____g正確答案：:3正確答案：:104.1Exercises第1題20.00mLof0.2000mol/LNaOHsolutionwasrequiredtocompletelyneutralized40.00mLofH2C2O4solution.However,20.00mlKMnO4solutionwasrequiredtocompletethetitrationreactionwith40mLH2C2O4solutionwhichconcentrationissametotheaboveH2C2O4solution.So,theconcentrationoftheKMnO4solutionis____mol/L.正確答案：:0.04000第2題Theredoxtitrationmethodwasusedtodeterminethechromium-containingsamples.Aftersampledecomposition,Cr(Ⅲ)wasoxidizedtoCr(Ⅵ),andthentitratedby0.1mol/lFe2+solution.Giventhatthechromium-containingsamplecontains10%chromium,pleasecalculatehowmanysampleshouldbeweighed____gtoconsume30mLofFe2+solution.[Ar(Cr)=52.00]正確答案：:0.5第3題第4題5.1Exercises第1題Whatistherelationshipbetweenconjugatedacid-basepairKaandKbinaqueoussolution.(

)AKa·Kb=1BKa·Kb=KwCKa/Kb=KwDKb/Ka=Kw第2題TheconjugateacidofOH-is(

)AH+BH2OCH3O+DO2?第3題Whichofthefollowingacid-basecomponentsisaconjugateacid-basepair.(

)AHCN-NaCNBH3PO4-Na2HPO4C+NH3CH2COOH-NH2CH2COO-DH3O+-OH-5.2Exercises第1題TheprotonbalanceequationofNaClaqueoussolutionwithc(NaCl)=0.1mol/Lis(

)A[Na+]=[Cl-]=0.1mol/LB[Na+]+[Cl-]=0.1mol/LC[H+]=[OH-]D[H+]+[Na+]=[OH-]+[Cl-]第2題ThemassbalanceformulaofNa2CO3solutionwithc(Na2CO3)=0.1mol/Lis(

)A0.1mol/L=[CO32-]=2[Na+]B0.1mol/L=[CO32-]+[Na+]C0.1mol/L=[H2CO3]+[HCO3-]+[CO32-]=[Na+]/2D0.1mol/L=[H2CO3]+[HCO3-]+2[CO32-]=[Na+]第3題40mLof0.15mol/LHClsolutionwasaddedto60mLof0.10mol/LNa2CO3solution.Thesimplifiedprotonbalanceequationofthissolutionis(

)A[H2CO3]=[HCO3-]B[HCO3-]=[CO32-]C

[H2CO3]=[CO32-]D[H2CO3]=[H+]第4題Theprotonbalanceequationofamixedsolutioncontaining0.10mol/LHCland0.20mol/LH2SO4is____.正確答案：:[H+]-0.30=[OH-]+[SO42-]第5題Theprotonbalanceequationof0.1mol/L(NH4)2HPO4solutionis

____.Theprotonbalanceequationof0.1mol/LH2SOsolutionis____.正確答案：:[H+]+[H2PO4-]+2[H3PO4]=[NH3]+[PO43-]+[OH-]正確答案：:[H+]=[SO42-]+[OH-]+0.1mol/L5.3Exercises第1題PleasecalculatethepHvalueofaphosphatesolutionwiththemaximumconcentrationofHPO42-.(

)(ThedissociationconstantofH3PO4asfollows:pKa1=2.12,pKa2=7.20andpKa3=12.36)A4.66B7.20C9.78D12.36第2題ThedissociationconstantofH3PO4asfollows:pKa1=2.12,pKa2=7.20andpKa3=12.36.ThemainformofaphosphatesolutionatpH=4.66is(

)APO42-BH2PO4-CHPO42-+H2PO4-DH2PO4-+H3PO45.4Exercises第1題TherearethreebasicsubstanceaqueoussolutionsthatcontainCO32-,S2-andC2O42withthesameconcentration.Theorderofthealkalinestrength(fromthelargesttothesmallest)ofthreebasicsubstanceaqueoussolutionsis(

)(H2CO3:pKa1=6.38pKa2=10.25;H2S:pKa1=6.88pKa2=14.15;H2C2O4:pKa1=1.22pKa2=4.19)ACO32->S2->2C2O42-BS2->C2O42->CO32-CS2->CO32->C2O42-DC2O42->S2->CO32-第2題

Therewerethreesolutions(A,BandC)withthesamevolumeandconcentrationofH2C2O4,NaHC2O4orNa2C2O4,respectively.IfHClorNaOHwasusedtoadjustthethreesolutionstothesamepH,andwaterwasaddedtomakethevolumeinthreesolutionsisthesame.Whichofthefollowingstatementsiscorrect?(

)ATheconcentrationofHC2O4-inAsolutionisthehighest.BTheconcentrationofHC2O4-inBsolutionisthehighest.CTheconcentrationofHC2O4-inCsolutionisthelowest.DThreesolutionhavethesameconcentrationofHC2O4-.第3題Threesolutions:(a)NaH2PO4,(b)KH2PO4and(c)NH4H2PO4.Theinformationasfollows:c(NaH2PO4)=c(KH2PO4)=c(NH4H2PO4)=0.10mol/L.WhatistherelationshipofthepHvalueofthreesolutions?(

)Aa=b=cBaCa=b>cDa=b第4題5.5Excercises第1題

WhenthepHvalueofNH3-NH4Clbufferis9.0,[NH3]/[NH4Cl]inthisbufferis____.(NH3:Kb=1.8×10-5)正確答案：:0.56第2題ComparethepHvaluesofthefollowingsolutions.(1)equivalentconcentrationofNaH2PO4(a)andNH4H2PO4(b):(a)____(b).equivalentconcentrationofNa2HPO4(c)and(NH4)2HPO4(d):(c)____(d).[pKb(NH3)=4.74;H3PO4:pKa1=2.16,pKa2=7.20,pKa3=12.36]正確答案：:=正確答案：:＞5.7Exercises第1題Becauseoftheinconspicuoustitrationjump,whichofthefollowingacid-basetitrationscannotbeanalyzedbydirecttitration.(

)ANaCNistitratedwithHCl(HCN：pKa=9.21)BSodiumphenoxideistitratedwithHCl(Phenol:pKa=10.00)CPyridinesaltistitratedwithNaOH(Pyridine:pKb=8.77)DMethylaminesaltistitratedwithNaOH(Methylamine:pKb=3.37)第2題

0.1mol/Lweakacid(pKa=4.0)wastitratedwith0.1mol/LNaOHandthejumprangeis7.0-9.7.Whenanotherweakacid(pKa=3.0)wastitratedwith0.1mol/LNaOH,thejumprangeis____.正確答案：:6.0-9.75.9Exercises第1題Whichofthefollowingstatementsiscorrect?(

)AHClistitratedbyNaOH,andmethylorangeasindicator,theendpointerrorispositive.BHClistitratedbyNaO,andtheendpointerrorispositive.CWhenNH4+wasdeterminedbydistillation,NH3gaswasabsorbedbyHClandtitratedwithNaOHstandardsolutiontopH=7.0,theendpointerrorispositive.DH3PO4wastitratedwithNaOHtopH=5.0.Atthefirststoichiometricpoint,theerroroftheendpointispositive.第2題Whichofthefollowingstatementsaboutacid-baseindicatorsisincorrect?(

)ATheindicatorisanorganicweakacidorweakbaseBItisbetterwhenthecolorchangerangeofindicatorisnarrowerCThecolorchangerangeofindicatormustbewithintherangeoftitrationjumpDItisbetterwhenthegreatercolordifferencebetweenHInandIn-occurs.第3題DuringHCltitrationtoNaOHsolution,morephenolphthaleinindicatorindicatesmoresensitivecolor-changeandsmallertitrationerror.Doesthisstatementcorrectornot?第4題

Phenolphthaleinindicatoriscolorlessinacidsolutionandredinalkalinesolution.Doesthisstatementcorrectornot?5.10Excercises第1題第2題第3題6.2Exercises第1題Thecumulativeequilibriumconstants(lgβ1;lgβ2)ofthecomplexwhichisformedbyethylenediamine(L)andAg+are4.7and7.7,respectively.PleasestatethemostpossibleformsofsilverinthefollowingpL.pL=2.0pL=3.0pL=3.85pL=6.0________________正確答案：:AgL2正確答案：:[AgL2]=[AgL]正確答案：:AgL正確答案：:Ag+6.3Exercises第1題Intheammoniasolution(pH=10.0),thecalculatedZn(NH3)=104.7,Zn(OH)=102.4,andY(H)=100.5,inthecase,lgK'(ZnY)is()A8.9B11.8C14.3D11.3第2題M(L)=1indicates-------(

)ANosideeffectsbetweenMandLBThesideeffectsofMandLarequiteseriousCMhasminorsideeffectsD[M]=[L]第3題Whichofthefollowingstatementsisincorrect.()A

ThestabilityofthecomplexwasreducedbytheacideffectofcomplexantBThestabilityofthecomplexwasreducedbythehydrolyticeffectofmetalionsCThestabilityofthecomplexwasreducedbytheauxiliarycomplexationeffectDThestabilityofthecomplexwasreducedbyvarioussidereactions第4題6.4Exercises第1題WhenZn2+istitratedwithEDTAtothestoichiometricpointinammoniabuffer,(

)iscorrect.ABCD第2題GivenlgK(ZnY)=16.5andpH4567lgaY(H)8.446.454.653.32When0.02mol/LZn2+solutionistitratedwith0.02mol/LEDTA,themaximumallowableacidityis().(Requirement:DpM=0.2，Et=0.1%)ApH≈4BpH≈5CpH≈6DpH≈7第3題WhenthemetalionsaretitratedwithEDTA,theconditionthatresultsinaccuratetitration(Et<0.1%)is(

)AlgK(MY)≥6.0BlgK'(MY)≥6.0Clg[c計K(MY)]≥6.0Dlg[c計K'(MY)]≥6.0第4題TwosolutionthatcontainthesameconcentrationofZn2+aretitratedwith0.01mol/LEDTA.Onecontains0.2mol/LfreeNH3,andanothercontains0.5mol/LfreeNH3.Intheabovetwocases,thecorrectdescriptionofpZn'is(

)ApZn'isequalbeforethestoichiometricpointBpZn'isequalatthestoichiometricpointCpZn'isequalafterthestoichiometricpointDpZn'isnotequalinalloftheabovecases第5題EDTAsolutionwasusedtotitrateequivalentconcentrationofmetalion.Keeptheotherconditionsunchanged,andjustonlyincreasestheconcentrationofEDTAandmetalionto10-folds,pleasecalculatethecorrespondingtitrationfractionwhenthepMvalueinthetwotitrationsarethesame.()A0%B50%C100%D150%第6題ToprepareasolutionwithpH=4.0andpZn=7.9,theratiooftheamountofEDTAtotheamountofZn2+[n(Y):n(Zn)]is(

).[pH=4.0,lgK'(ZnY)=7.9]-------------------------(

)A1:1B2:1C1:2D3:1第7題0.020mol/LEDTAwasusedtotitrateequivalentconcentrationofPb2+intartrate(A)-containingammoniabuffer(pH=10).Theotherinformationsasfollows:(1)lgK(PbY)=18.0,(2)Atthestoichiometricpoint,lgY(H)=0.5,lgPb(OH)=2.7,lgPb(A)=2.8(ThecomplexisformedbyPb2+andA).Pleasecalculatethefollowingparametersatthestoichiometricpoint.lgK'(PbY)=____，pPb'=____，pPbA=____，pPb=____。正確答案：:14.4正確答案：:8.2正確答案：:8.5正確答案：:11.3第8題0.02000mol/LEDTAsolution(10.05mL)wasmixedwith0.02000mol/LPb(NO3)2solution(10.00mL)[lgK(PbY)=18.0,pH=5.0,lgY(H)=6.5].TheconcentrationofuncomplexedPb2+is

____mol/L。正確答案：:10-9.2(或6.3×10-10)6.5Exercises第1題第2題6.6Exercises第1題7.1Exercises第1題Foranox-redpair,theconditionalelectrodepotential(?°‘)at25℃canbecalculatedas().ABCD第2題Given(Fe2+/Fe)=-0.440V,

(Sn4+/Sn2+)=0.154V(Sn2+/Sn)=-0.136V,

(Cu2+/Cu+)=0.159V(Cu+/Cu)=0.522VWhenSn4+isreducedwithmetallicironinacidicsolution,itwillgenerate____;whenCu2+isreducedwithmetallicironinacidicsolution,itwillgenerate____.正確答案：:Sn2+正確答案：:Cu第3題

CalculatetheconditionalelectrodepotentialoftheHg2+/Hg22+pairinasolutioncontaining0.10mol/LCN-.(Ignoringtheeffectofionicstrength).____Thecorrespondingconditionsareasfollows:(Hg2+/Hg22+)=0.907V,Ksp[Hg2(CN)2]=5.0×10-40ThecomplexofHg2+andCN-:lgβ4=41.4正確答案：:-0.199(V)7.2Exercises第1題Thepotentialofreaction2A++3b4+→2a4++3B2+atthestoichiometricpointcanbecalculatedby()A[(A)+(B)]/2B[2(A)+3(B)]/5C[3(A)+2(B)]/5D

6[(A)-(B)]/0.059第2題Pleasecalculatethe?electrode?potentialof?titration?ofCe4+to?Fe2+to99.9%,100%and100.1%,respectively,in1mol/LHClsolution.(φθ’?(Fe3+/Fe2+)?=0.68V,??φθ’(Ce4+/Ce3+)=1.44V)A0.50V、0.41V、0.32VB0.17V、0.32V、0.56VC0.23V、0.41V、0.50VD0.23V、0.32V、0.50V7.3Exercises第1題第2題7.4Exercises第1題第2題7.5Exercises第1題第2題8.1Exercises第1題WhendeterminingtheconcentrationofCl-byMohrmethod,thepHofthemediumisrequiredbetween6.5to10.5.IfthepHvalueistoolow,whatwillbehappened?()AIncompleteprecipitationofAgClB

AgClprecipitateiseasytodissolveCAgClprecipitateabsorbsexcessiveCl-DAg2CrO4precipitatecannotbeformedeasily第2題WhichofthefollowingconditionsshouldbeusedforthedirectdeterminationofsilversaltbyusingoftheVolhardmethod?()AStrongacidityBWeakacidityCNeutraltoweakalkalineDStrongalkalinity第3題Whichofthefollowingindicatorsshouldbeused

inthedeterminationofchloridebyusingoftheFajansmethod?()AFerroammoniumvanadiumBEosinCFluoresceinDPotassiumchromate第4題Amongthefollowingfourions,whichonewasdeterminedbytheVolhardmethod,dichloroethaneshouldbeaddtopreventtheconversionofprecipitates.?AI-BCl-CBr-DSCN-第5題TheindicatorusedforthedeterminationofCl-orBr-byMohr'sMethodis().AK2Cr2O7solutionBFluoresceinsolutionCFerroammoniumvanadiumsolutionDK2CrO4solution9.2Exercises第1題Thesolubilityproductconstant(Ksp)ofAg2Sis2.0×10-48,anditssolubilityinwateriscalculatedas____正確答案：:D第2題ThedissolutionequilibriumreactionoftheslightlysolublecompoundA2B3insolutionis,A2B3==2A+3B.ThemeasuredconcentrationofBis3.0×10-3mol/L,andthesolubilityproductconstant(Ksp)ofthisslightlysolublecompoundis()A1.1×10?13B2.4×10?13C1.0×10?14D2.6×10?11第3題第4題9.3Exercises第1題Pleasecomparethesolubilityofthecorrespondingsubstances(>,<,=)(1)AgCl(inpurewater)____AgCl(in0.1mol/LNH4Cl)(2)AgCl(in2mol/LNaCl)____AgCl(inpurewater)(3)AgCl(in0.01mol/LNaCl)____AgCl(in2mol/LHCl)(4)Ag2CrO4(inpurewater)____AgCl(inpurewater)(5)Ag2CrO4(in0.001mol/LAgNO3)____Ag2CrO4(in0.001mol/LK2CrO4)[Ksp(Ag2CrO4)=2.0×10-12,Ksp(AgCl)=1.8×10-10,ThecomplexformedbyAg+andCl-,lgβ1=3.0,lgβ2=5.0]正確答案：:>正確答案：:>正確答案：:<正確答案：:>正確答案：:<9.5Exercises第1題Intheprocessofgravimetricanalysis,whentheionradiusofimpuritiesisclosetotheionradiusofthesubstance,whichofthefollowingphenomenonareeasilyoccurredduringprecipitationprocess.---------------------------(

)AMixedcrystalBOcclusionCEntrapmentD

Postprecipitation第2題WhenBaCl2solutioncontainsimpuritiessuchasNaCl,KClandCaCl2,whichionisthemosteasilyadsorbedbytheBaSO4precipitatewhichwasgeneratedbyaddingH2SO4?ANa+B

K+CCa2+DH+9.6Exercises第1題Whenwashingamorphousprecipitatesingravimetricanalysis,whichwashingsolutionshouldbeselected?-------------------------(

)AColdwaterB

HotdilutedelectrolytesolutionCDilutedsolutionofprecipitantDOrganicsolvents第2題Whichofthefollowingstatementagainsttheconditionsofamorphousprecipitation?----------------------------------------------(

)APrecipitationshouldbecarriedoutinhotsolutionBPrecipitationshouldbecarriedoutinaconcentratedsolutionC

PrecipitantshouldbeaddedquicklyundercontinuousstirringDTheprecipitateshouldbeleftovernighttoagetheprecipitate第3題Whichofthefollowingstatementsiswrong?()AInconsiderationofthesmallparticlessizeofamorphousprecipitates,densefilterpaper(slowspeed)shouldbeselectedtopreventprecipitatesfrompassingthroughthefilter.BThelargercriticalvalue(Q/S)ofslightlysolublecompoundsindicatesthebiggerbarriertostarthomogeneousnucleation.CThegreatertherelativesupersaturationindicatesthehigherdispersion.DHomogeneousnucleationreferstothespontaneousformationofcrystalnucleusbycrystalions.10.1Exercises第1題Thewavelengthrangeofvisiblelightspectrumis____；Thecorrespondingenergyrangeis____eV。正確答案：:400-800nm正確答案：:1.65-3.1ev第2題Amongthefollowingfactors:thicknessofcuvette,concentrationofcoloredcomplex,colorofcomplex,wavelengthofincidentlight,whichfactorsaffectthemolarabsorptioncoefficientofcoloredcomplex?____正確答案：:wavelengthofincidentlight第3題WhenmeasuredbyDithizone-CHCl3spectrophotometricmethod,theabsorbancesof0.001mol/LsolutionofZn2+at475nmandzinctestsolutionat700nmare0.129and0.764,respectively.Inthecase,ifthe0.001mol/lzincstandardsolutionisusedasreferencesolutionbydifferentialspectrophotometry,theabsorbanceofextractioncomplexofzinctestsolutionis____;itisequivalenttomagnifyingthescaleby____times;inotherword,theaccuracyisimprovedby____times.正確答案：:0.301正確答案：:5正確答案：:510.2Exercises第1題

ThelighttransmittancerelationshipoftwocoloredcomplexesMandNislgTN-lgTM=1,so,theabsorbancerelationshipAN-AMis____。正確答案：:-1第2題Substanceshowsanultraviolet-visibleabsorptionspectrumafterinteractingwithelectromagneticradiation,thereasoncanbeattributedto()AVibrationaltransitionsofmoleculesBTransitionoftheouterelectronofthenucleusCRotationaltransitionsofmoleculesDVibrationandrotationaltransitionsofmolecules第3題WhenusingLambert-Beerlawforquantitativeanalysisinspectrophotometry,theincidentlightis()AWhitelightBMonochromaticlightCVisiblelightDUVlight第4題ThemolecularweightofKMnO4is158.03g/molanditsmolarabsorptioncoefficient(ε545)is2.2×103.WhentheconcentrationofKMnO4solution0.0020%(volumemassfraction)andthesizeofcuvetteis3.00cm,themeasuredtransmittanceat545nmis____正確答案：:15%第5題TheabsorbanceofachromogeniccomplexisA1.Afterthefirstandseconddilutions,theabsorbanceisA2andA3,respectively..Therearetwoequations:A1-A2=0.50,A2-A3=0.25.WhatisthetransmittanceratioT3:T1?____正確答案：:5.6210.4Exercises第1題Whichofthefollowingstatementsiswrong？()AThemolarabsorptioncoefficientispositivecorrelativetothesubstance’sconcentrationBAbsorbance(A)ispositivecorrelativetothesubstance’sconcentrationCAbsorbance(A)ispositivecorrelativetothesubstance’sconcentrationDThetransmittance(T)isnegativecorrelativetothethicknessofcuvette第2題MeasuringacoloredsolutionbyusingofBeer'slaw,whentheconcentrationisc,thetransmittanceisT.Iftheconcentrationischangedtoc/3andotherconditionsremainunchanged,thenTis____.whentheconcentrationis2c,Tis____正確答案：:T1/3正確答案：:T2第3題第4題Strongacidstitrateweakbases,whichofthefollowingindicatorscannotbeused()AMethylorangeBMethylredCPhenolphthaleinDBromophenolblue(pKHIn=4.1)10.5Exercises第1題AchromogenicreagentformsacoloredcomplexwithCo(Ⅱ).Theabsorbance(A)ofthiscoloredcomplexis0.58attheabsorptionwavelengthof598nm,thetransmittance(T)is____.AchromogenicreagentformsacoloredcomplexwithCo(Ⅱ).Thetransmittance(T)ofthiscoloredcomplexis70.0%atthewavelengthof540nm,theabsorbance(A)is____.Iftheinstrumentmeasurementerror(ΔT)is±0.5%,therelativeerrorsoftheabovetworesultscausedbytheinstrumentmeasurementare____and____,respectively.正確答案：:26.3%正確答案：:0.155正確答案：:±1.42%正確答案：:±2.0%第2題Finalexam第1題Ifasmallnumberofanalyticalsamplesaretakenfromalargenumberofanalyticaltargets,itmustbeensuredthatthesampleis()AAcertainamountoftimeBUniversalityCStabilityD

Representative第2題Themaximumdiameterofacertainoreis30mm.IfK=0.05anda=2,theamountofsampleshouldbetakenas()A1.5gB1.5kgC45kgDNotlessthantheamountofanalysis第3題Forlargermetalcastings,thecorrectsamplingmethodis()AFilesomemetalscrapsonthesurfaceofthecastingassamplesBAllpartsofthecastingsurfaceshouldbefiledwithmetalscrapsandmixedassamplesC

HammerdownasampleDDrillholesindifferentpartsofthecastingthroughtheentireobjectorhalfofthethickness,collectcuttingsmixedassample第4題Whenthesampleiscrushedtoacertaindegree,itneedstobescreened,thecorrectmethodsis()AAslongasthesamplethroughthesieveislargeenoughforanalysis,therestmaybediscardedaltogetherBAcoarsesievewasusedfirst,andthemeshnumberincreasedwiththesamplesizedecreasingCThesuitablesieveisselectedaccordingtotheparticlesizeoftheanalyticalsampleDAsmallnumberofsamplesthatdonotpassthroughthesievecanbereducedandprocessingremovedforsavetimeandlabor第5題Thepurposeofsampledecompositioninanalysisistotransformthesampleinto()AWater-solublesubstancesBSimplecompoundsC

SedimentDSimplesubstance第6題

Whenabeamof()passesthroughthecoloredsolution,theabsorbanceofthesolutionisproportionaltotheproductofthesolutionconcentrationandthethicknessoftheliquidlayer.AParallelvisiblelightBParallelmonochromaticlightCSunlightDUV-light第7題Itisknownthatlargemolarabsorbancecoefficientofasubstance(k)incopperspectrophotometry,itindicatesthat()ATheconcentrationofthesubstanceisveryhighBThesubstancehasastrongabsorptionoflightatacertainwavelengthCThesensitivityofthesubstanceisveryhighDThedeterminationofthesubstanceisaccurate第8題Theprincipleofchoosingreferencesolutioninphotometricanalysisis()AGenerallychoosedistilledwaterBUsuallychoosereagentsolutionsCThechoiceisaccordingtotheadditionofreagentandtestsolutioncolorDGeneralchoiceoffadingsolution第9題Thereferencesolutionis()AAsolutionwithzeroabsorbanceBAsolutionwithafixedabsorbanceCSolutionwithabsorbanceof1DNoneofthesethreesolutions第10題Duringtitration,whicherrorwillbeintroducedintotherecordeddataifthetitrantattachedtothewallofthetubedoesn’tflowdown?()APositiveerrorBNegativeerrorCNoeffectDBothpositiveandnegativeerrorsarepossible第11題Theanalysisofsampledosageof0.1~10mgiscalled()AMacroanalysisBSemimicroanalysisC

MicroanalysisDTraceanalysis第12題Whichisnotrequiredbytitrationforchemicalreactionsinthefollowingstatements?()AThereactionmusthaveadefinitestoichiometricrelationshipBThereactionhastobecompletedCThereactionmustbequickDAhighermolarmassforthereactants第13題Whichofthefollowingstatementsistrue?()ATheburettemusthaveaninitialreadingof"0.00"B

Indirecttitration,thereactantsshouldhaveasimpleintegerratioCTitrationanalysishastheadvantageofhighsensitivityDThemainconditionthatthesubstanceshouldhaveislargemolarmass第14題Whenthesampleisweighedbysuccessivesubtractionmethod,awornweightisusedforthefirstreading.Howdoesthisaffecttheresultsoftheanalysis?()APositiveerrorBNegativeerrorCNoeffectDUnclear第15題WhenmetalionsaretitratedwithEDTAinnon-buffersolution;thepHofthesolutionisgoingtobe()ARisedBReducedCNoeffectDRelatingtothevalencestateofmetalions第16題TheappropriatestandardsubstancetocalibratetheconcentrationofEDTAsolutionis()AAgNO3(AR)BCaCO3(AR)CFeSO4·7H2O(AR)DCaO(SP)第17題WhenEDTAcomplexeswithmetalions,thenumberofcoordinationatomsforonemoleculeofEDTAcanprovideis()A2B4C6D8第18題

Pointouttheerroneousconclusionsinthefollowingstatements()ATheacideffectofcomplexingagentreducesthestabilityofcomplexBThehydrolyticeffectofmetalionsreducesthestabilityofthecomplexCTheauxiliarycomplexationeffectreducesthestabilityofthecomplexD

Allkindsofsidereactionsarenotconducivetotheoccurrenceofthemainreactionofcomplexometrictitration第19題WhatistheeffectofFe3+andAl3+onEriochomeblackT()ARigideffectB

OxidationeffectCSedimenteffectDEnclosureeffect第20題TherelationshipbetweenKaandKbinanaqueoussolutionis()A

Ka·Kb=1BKa·Kb=KwCKa/Kb=KwDKb/Ka=Kw第21題WhichofthefollowinghasthehighestpHinanaqueoussolutionofthesameconcentration()ANaClBNaHCO3CNH4ClD

Na2CO3第22題Strongacidstitrateweakbases,whichofthefollowingindicatorscannotbeused()AMethylorangeBMethylredCPhenolphthaleinDBromophenolblue(pKHIn=4.1)第23題Accordingtotheprincipleofanalyticalmethod,analyticalchemistrycanbedividedas()AStructuralanalysis,quantitativeanalysisandqualitativeanalysisB

InorganicanalysisandorganicanalysisCChemicalanalysisandinstrumentalanalysisDMacroanalysisandmicroanalysis第24題Inthetaskofanalyticalchemistry,theprocessofcharacterizingthechemicalstructureofasubstanceiscalled()analysisAQualitativeB

QuantitativeC