第1題Knownatacertaintemperature

Thenunderthesameconditions,thereactionSnO

2(s)+2H2(g)

=Sn(s).

Kfor+2H2O(g)

isA0.058B21C8.2×10－4D0.71第2題Foranyreversiblereaction,thefollowingconditionscanchangetheequilibriumconstant().AIncreasereactantconcentration;BIncreasingtheconcentrationofproducts;CAddcatalyst;DChangethereactiontemperature第3題Gasreaction2A=B,whatmeasuresaretakentofacilitatetheformationofB().AIncreasethepressureanddecreasetheconcentrationofA;BReducethepressureandincreasetheconcentrationofB;CIncreasethepressureanddecreasetheconcentrationofB;DReducethepressureandincreasetheconcentrationofA第4題ReactionCaCO3()=CaO()+CO2(),Afterreachingequilibriumundercertainconditions,ifthevolumeofthecontaineriscompressed,theequilibriummovesinthedirectionofpositivereaction.()第5題Thefactorsaffectingthevalueoftheequilibriumconstantofchemicalreactionsaretheconcentrationofreactants,temperature,catalyst,concentrationofreactionproducts,etc.()第6題Whenthereversiblereactionreachesequilibrium,thereactionstops,andtheconcentrationofreactantsandproductsisequal.()第7題Anyreversiblereactionatacertaintemperature,regardlessoftheinitialconcentrationofthesubstancesparticipatinginthereaction,whenthereactionreachesequilibrium,theequilibriumconcentrationofeachsubstanceisthesame.()第1題Inordertoensuretheaccuracyoftheanalysis,thefollowingrequirementsforstandardsolutionsareunreasonable().AAccuratecalibration;BProperpreservation;CMustbematchedonthesameday,usedonthesameday;DGenerally,itmustbecalculatedto4significantdigits第2題Thefollowingsubstancesthatcanbeusedforthedirectpreparationofstandardsolutionsare().AsolidNaOHBsolidK2Cr2O7CConcentratedHClDP.)EsolidNa2S2O3·5H2OFR.);GR.);HR.);第3題Thefollowingsubstancescanbeusedasreferencesubstances().AHigh-qualitypureNaOH;BCaOdriedat100°C;CSpectrallypureCo2O3;D99.99%purezinc第4題Themeaningofthereferencesubstanceinquantitativeanalysisis().APuresubstance;BReferenceMaterials;CCompositionofaconstantsubstance;DSubstanceswithhighpurity,certaincomposition,stablepropertiesandlargemolarmass第5題Theendpointerrorisdueto().AThetitrationendpointdoesnotmatchthestoichiometricpoint;BIncompletetitrationreaction;CThesampleisnotpureenough;DBurettereadingsareinaccurate第6題Intitrationanalysis,thesuddenchangeinthecoloroftheindicatorisgenerallyusedtojudgethearrivalofthestoichiometricpoint,andthetitrationisstoppedwhentheindicatorchangescolor.Thisiscalled().AStoichiometricpoints;BTitrationanalysis;CTitration;DTitrationendpoint第7題Ofthefollowingstatements,thecorrectoneis().AChemicalreactionsintitrationanalysisarecollectivelyreferredtoastitrationreactions;BTheutensilsusedintitrationanalysisarecollectivelyreferredtoastitrationanalysisvessels;CChemicalreactionsoccurringinelectrolytesolutioncanbeusedfortitrationanalysis;DChemicalreactionsfordirecttitrationmustbequantitative,rapid,andcompleteErroranddataprocessing第1題Thefollowingfourdatamodifiedtoafour-digitsignificantdigitis

0.5624

.（1）0.56235

（2）0.562349

（3）0.56245

（4）0.562451A1，2B3，4C1，3D2，4第2題

Inasetofparallelassays,themassfractionsofcalciuminthesampleweremeasuredtobe

22.38,22.36,

22.40,

22.48,

respectively（）。(known:

Q0.90=0.64,

n=5).A22.38B22.40C22.48D22.36第3題ThecontentofSiO2

insilicatewasdeterminedbyweighing

methodandtheresultswere

37.40%,37.20%,

37.30%and

37.50%,

respectively

37.30%,itsaveragedeviationis()A0.09%B0.24%C0.01%D0.12%第4題The

resultofcalculating2.236×1.1124÷1.036×0.2000bythecalculatoris12.004471,andtheresultshouldberevisedto(C)accordingtotherulesofsignificantdigitarithmetic.A12B12.0C12.00D12.004第5題Weighingasampleonanelectronicbalancemaycauseamaximumabsoluteerrorof0.0002g,iftherelativeerrorrequiredtobeweighedislessthanorequalto0.1%,themassoftheweighedspecimenshouldbe().AGreaterthan0.2g;BGreaterthanorequalto0.2g;CGreaterthan0.4g;DLessthan0.2g第6題Thecalculationfor0.0234×4.303×71.07÷127.5is().A0.0561259B0.056C0.05613D0.0561第7題Whendeterminingthesulfurcontentincoal,theweighingamountisspecifiedtobe3g,accurateto0.1g,thenwhichofthefollowingsetsofdataindicatesthattheresultsaremorereasonable().A0.042%B0.0420%C0.04198%D0.04%第8題TomeasuretheSO3contentinacementclinker,fivepeoplewillmeasureitseparately.Thesampleweighingamountwas2.2g,andfivepeopleobtainedfivereportsasfollows.Whichreportisreasonable().A2.10%B2.09%C2.08%D2.1%第9題Revise1245.51tofoursignificantdigits,correct().A1246B1245C1.245×103D1.246×103第10題Theconcentrationofastandardtitrationsolutionis0.5010moL/L,anditseffectivenumberis().A5bits;B4bits;C3bits;D2bits第11題Quantitativeanalysisworkrequirestheerror()ofthemeasurementresults.AThesmallerthebetter;Bequalto0;CNorequirements;DWithintheallowablemarginoferror第12題()meansthatthesameoperator,inthesamelaboratory,withthesameinstrument,accordingtothestepsspecifiedinthesametestmethod,simultaneouslycompletetwoormoremeasurementprocessesofthesamespecimen.ARepeattest;BParalleltest;CReproductiontest;DControlledtrial第13題Intheanalysisprocess,checkwhetherthereisasystematicerror,andthe()testisthemosteffectivemethod,sothatthetestresultscanbecorrectedandthesystematicerroreliminated.ADuplication;BBlank;CControl;DReproducibility第14題Thefollowingstatementiscorrect().AHighprecision,accuracymustalsobehigh;BHighaccuracy,systematicerrormustbesmall;CIncreasingthenumberofmeasurementsmaynotnecessarilyimprovetheprecision;DLargeaccidentalerror,precisionisnotnecessarilypoor第15題Thecorrectofthefollowingstatementsis().AHighaccuracymustrequirehighprecision;BFaulterrorinanalyticalmeasurementsisunavoidable;CHighprecision,thesystemerrormustbesmall;DHighprecision,highaccuracySafeoperationinlaboratory第1題Usedhighlyvolatileorganicsolvents,should().APourintoasealedsewer;BStoreafterdilutionwithwater;CPourintorecyclingbottles;DStoreinafumehood第2題Thewasteliquidcontaininginorganicacidcanbetreatedby().APrecipitationmethod;BExtractionmethod;CNeutralizationmethod;DRedoxmethod第3題Theknowledgeabouttheprotectionofelectricalequipmentisincorrect().ACorrosivechemicalsaresprinkledonthewiresandshouldbedealtwithintime;BElectricalequipmentwiresshouldnotpassthroughwetplaces;CSublimationsubstancescanbeputintotheovenfordrying;DElectricalinstrumentsshouldbeoperatedinaccordancewiththeprovisionsofthemanual第4題Whenorganicsolventssuchasgasolinecatchfire,whichofthefollowingsubstancescannotbeusedtoextinguishthefire().ASand;BWater;CCarbondioxide;DCarbontetrachloride第5題Itshouldbeplacedawayfromorganicmatterandreducingsubstances,andrubberglovescannotbewornwhenusing().Aconcentratedsulfuricacid;Bconcentratedhydrochloricacid;Cconcentratednitricacid;DConcentratedperchloricacid第6題Iftheskinissplashedwithconcentratedalkaliinthelaboratory,itisrinsedwithalargeamountofwaterandthentreatedwith().A5%bakingsoda;B2%nitricacidsolution;C5%boricacidsolution;D(1+5000)potassiumpermanganatesolution第7題Theuseofconcentratedhydrochloricacid,concentratednitricacid,mustbecarriedoutin().ALargecontainers;BGlassware;CCorrosion-resistantcontainers;DFumeho第8題WhenusingconcentratedH2SO4,ifaccidentallysplashedonhands,thecorrecttreatmentmethodis().AWashimmediatelywithwaterandthenrinsewith2%soda;BWashwith2%sodafirst,thenrinsewithwater;CRinseimmediatelywithwaterandthenwashwithNaOHsolution;DRinsefirstwithNaOHsolutionandthenwashwithwater第9題Suitableplugs,sockets,switchesandfusesshouldbeconfiguredaccordingtothepoweroftheinstrumentandequipment,therequiredpowersupplyvoltageindicators,andthegroundwireshouldbeconnected.()第10題Flammableliquidwasteliquidshallnotbepouredintothesewer.()第11題Itisabsolutelyforbiddentobake,burnflammable,explosiveandcorrosiveitemsandnon-experimentalsuppliesintheovenandhightemperaturefurnace,anditisnotallowedtoheatfood.()第12題Bariumsalttouchespeople'swoundscanalsopoisonpeople.()Operationofelectronicbalance第1題Ofthefollowingstatementsaboutthemethodofdifferencesubtraction,theoneisincorrect().AWhenweighing,theweighingbottlecanbetakenwithapaperstriporwithaspecialweighingglove;BWhenweighing,themassoftheweighedobjectexceedstherequiredrangetoomuch,anditshouldbeweighedagain;CTheweighingflaskcontainingtheweighingobjectshouldbewashedanddriedwithdeionizedwater;DWhenweighing,asmallspooncanbeusedtoremovethesamplefromtheweighingflasktothesampleholder第2題Thewronguseoftheweighingflaskis().ACannotbeusedasareactor;BClosethelidtightlywhennotinuse;CThelidshouldbeusedtogether;DWashafteruse第3題Thefollowingdescriptionofweighingwithelectronicbalancesiscorrect().ADirectlytakeandplacetheweighingflaskbyhand;BWhenreading,thebalancedoorisopen;CThesampleisplaceddirectlyontheweighingtray;DTheelectronicbalanceshouldbewarmedupfirst第4題Ofthefollowingstatements,thecorrectoneis().ATheweighingprocesscannotbearbitrarilyplacedonthetrayoronthetable;BThereisnoneedtocleanthebalanceafterweighing;CWhentransferringthesample,gentlytaptheupperright(inner)edgeofthebottlemouthwiththecap;DThesampletemperatureshouldbehigherthantheroomtemperature第5題Theadvantageofthedifferentialreductionweighingmethodisthatitissuitableforweighing().ANon-deliquescencesubstances;BToxicsubstances;CMultiplesamplesthatarepronetodeliquescence;DNon-volatilesubstances第6題Whenweighingthesamplebythedifferencesubtractionmethod,itissuitableforweighing().AHighlytoxicsubstances;BSubstancesthatareeasytoabsorbmoisture,oxidize,andreactwithCO2intheair;CParallelmulti-componentsamplesthatarenoteasilyhygroscopic;DVolatilesubstances第7題Whentheweighedobjectishigherthanroomtemperature,itshould().AImmediateweighing;BRapidweighing;CColdtoroomtemperatureweighing;DWeighcoldto35°C第8題Oneten-thousandthbalancecanbecalled()mg.A1.0B0.1C0.01D>0.001第9題Thefollowingregardingtheuseofelectronicbalancesisincorrect().AElectronicbalancesdonotrequirecalibrationBThelevelshouldbeadjustedbeforeuseCTheelectronicbalanceshouldbepreheatedforaperiodoftimeaccordingtotheregulationsbeforeuseDCleaningthebalanceshouldbecarriedoutwhenthebalanceisoff第10題Electronicbalanceisacommonlyusedprecisioninstrumentinquantitativeanalysis,thefollowingstatementaboutelectronicbalanceiscorrect().ATheelectronicbalanceiseasytooperate,stablereading,highaccuracy,anddifferentmodelsofelectronicbalancehavethesameaccuracyBElectronicbalancesareelectronicinstruments,whichareverypreciseanddonotrequirecalibrationandzeroingCTheelectronicbalancehasazerokey,sothebeakerisnotcleanorwetDWhenusingthebalance,closethewindowoftheaccessoryanddonothitthedesktopwherethebalanceisused;ThesidedoorshouldbeclosedwhenreadingstopreventairflowfromaffectingweighingIdentification,washinganddryingofglassinstruments第1題Thefollowinginstrumentsthatshouldnotbeheatedare().ATesttubes;Bcrucible;CEvaporationdish;DPipette第2題Theglassinstrumentthatcanbedriedintheovenis().ABurette;BPipette;CWeighingflask;DVolumetricflask第3題Thestandardforjudgingwhethertheglassinstrumentiscleanedisonthewalloftheobserver().AWhethertheattachedwatergathersintowaterdroplets;BWhethertheattachedwaterformsauniformwaterfilm;CWhethertheattachedwatercanflowdowninstrands;DWhetherthereisasoiledsubstancethatissolubleinwater第4題Whentheburetteisoily,itcanbewashedwith(),rinsedwithtapwaterandwashedthreetimeswithdistilledwaterforlateruse.ADetergentpowder;BChromiumpicklingsolution;CStrongalkalisolution;DNoneofthemareright第5題Theoxidationcapacityofthechromiumpicklingsolutionisreducedtounusableafteruse,anditcanbeheatedtoremovethewaterandthenadded(),andafterthereactioniscomplete,theprecipitatecanbefilteredoutandused.AFerroussulfate;BPotassiumpermanganatepowder;CIodine;DHydrochloricacid第6題Amongthefollowinginstruments,afterrinsingwithdistilledwater,itisnecessarytorinsewithoperatingsolution2~3timesis().AErlenmeyerflaskfortitration;BBurettefortitrationorpipetteforpipettingtestsolution;CVolumetricflaskforpreparationofstandardsolution;DMeasuringcylinderfortakingreagents第7題Ofthefollowingstatementsaboutporcelain,theoneisincorrect().APorcelainwarecanbeusedasweighingvesselsinweighinganalysis;BSamplescanbedecomposedandtreatedwithhydrofluoricacidinaporcelaindish;CPorcelainwareisnotsuitableformeltingcarbonatesthatdecomposealkalimetals;DPorcelainwarehightemperatureresistance第8題Afterthefailureofthedesiccantcobaltdichloridediscolorationsilicagelinthelaboratory,itispresented().ARed;BBlue;Cyellow;DBlack第9題Thepreparedhydrochloricacidsolutionisstoredin().ABrownrubberstopperreagentbottle;BWhiterubberstopperreagentbottle;CWhitegrindingstopperreagentbottle;DReagentbottle第10題Whentheheatedobjectrequiresuniformheatingandthetemperaturedoesnotexceed100°C,theoptionalheatingmethodis().AConstanttemperaturedryingoven;BElectricfurnace;CGaslamp;DWaterbath第11題Nowitisnecessarytoprepare0.1000mol/LK2Cr2O7solution,andthemostsuitablegaugeamongthefollowinggaugesis().AVolumetricflask;BGraduatedcylinder;CScalebeaker;DAcidburette第12題Toprepare0.2mol/LH2SO4solutionand0.2mol/LHClsolution,()shouldbeselectedMeasuretheconcentratedacid.AWeightube;BCapacityjar;CAcidtitrationtube;DTransferpipe第13題Whenperformingtitrationanalysis,()shouldgenerallybeusedtopackthetitrationliquidsample.ABeaker;BTriangularbottle;CVolumetricflask;DJar第14題Thefollowinginstrumentscanbeheatedinaboilingwaterbath().AVolumetricflask;BGraduatedcylinder;CColorimetrictube;DTriangularflask第15題Thefollowinginstrumentsthatshouldnotbeheatedare().ATesttubes;Bcrucible;CEvaporationdish;DPipetteUseofcommonlyusedtitrationanalysisinstruments第1題Ofthefollowingstatements,thecorrectoneis(

).

ABuretisaninstrumentwithaccuratescale,generallycannotbebrushedwithabrush;

BWhenloadingthestandardsolutionintotheburette,itmustbetransferredwithabeaker;CWhenpipettingthesolution,thepipetteshouldbeimmersedinthesolutiontoadjusttheliquidleveltothescale;

DWhenthepipetteisdischarged,thetipofthetubeshouldbesuspendedandnotleanagainsttheinnerwallofthecontainer,andtheliquidinthetipofthetubeshouldbeblownintothereceiver第2題Theassemblyerrorofthetipis(）AA.

Thesignoftheclampingofthetipisslightlyover

theO-ring,andtheconnectionpartcanbeseentoformaclearsealingring;BB.

Insertthepipettegunverticallyintothetipandturnitslightlyleftandrightwithalittleforcetomakeitfittightly;

CC.

Pipettingaccordingtothenormaltipassemblymethodstillleaks,andthepipettetipneedstobereplaced;

DWhenputtingthetiponthepipettegun,tapthetipboxafewtimestomakesurethetipisjammed第3題Beforetitration,thebubbleshavebeenrushed,andafterthetitrationiscompleted,itisfoundthattherearebubblesinthetiptubeoftheburette,andthevolumeofthemeasuredsolution()ismeasured.AUnaffected;BLarge;CSmall;DUnabletotellwhetheritistoosmallortoolarge第4題Whentheburetteisread,thelineofsightislowerthantheliquidlevelandwillmakethereading().ALow;BHigh;CMaybehighorlow;DNoeffect第5題Beforeeachtitration,theburetteshouldaddthetitranttonearthe0scale,inorderto().AThereadingoftheB0.00scaleismoreaccuratethanthereadingelsewhere;CReducethenumberofreadingsandreducesystematicerrors;DReducethevolumeerrorcausedbythetitratorscaleisnotuniformenough;EEnsurethatthesolutionissufficientatthenexttitration第6題Forgraduatedcylinderswithavolumeof50mLandthescaleofacidburettes,thestatementiscorrect().AThetopscaleis50;BThebottomscaleofthegraduatedcylinderis0;CThebottomscaleoftheacidburetteis50;DThetopscaleofthegraduatedcylinderis50第7題Ifthevolumetricflaskisfoundtobeleaking,itshould().ASwapthegrindingstopper;BApplyoilaroundthecork;CDiscontinuationofuse;DDonotturnupsidedownwhenshaking第8題Thepipetterangeisadjustedincorrectly().AIfthepipettescaleknobandthepipettingbuttonareunified,usetopreventthescalefromchangingwhenthebuttonispressedduringpipetting;BWhenyouarefinishedusingthepipette,youneedtoadjustthepipettetothemaximumscale;CAdjustfromlargevolumetosmallvolume,accordingtothenormaladjustmentmethod,turntheknobtothespecifiedscale;DWhenadjustingfromsmallvolumetolargevolume,rotatetheknobtothespecifiedscaleaccordingtothenormaladjustmentmethod第9題Whenreleasingthesolutioninthepipette,waitabove()whentheliquidleveldropstothetipofthetube.A5sB10sC15sD20s第10題()Onlyonevolumecanbemeasured.APipette;BPipette;CGraduatedcylinder;DMeasuringcup第11題Thebubblesatthelowerendoftheburettemustberemoved,otherwiseitwillcausetitrationerrors.()第12題Beforethestandardsolutionisloadedintotheburette,theburetteshouldberinsed2~3timeswiththesolution,andtheErlenmeyerflaskalsoneedstoberinsedordriedwiththesolution.()第13題Aftertheburetteiswashedwithpurewater,itcanbeinjectedintothetitrationsolutionforoperation.()第14題Burettebelongstothevolumetricvolumetricinstrument.()第15題Itisnotsuitabletostorethesolutioninthevolumetricflaskforalongtime.()Preparationofsolution第1題ThepHstandardofthethree-levelwatertestofthelaboratorystipulatedbythestate

is().

A5.0~6.0B6.0~7.0C6.0~7.0D5.0~7.5第2題Toprepare

400mL0.05mol/LNa2S2O3

solution,Na2S2O3·5H2Oshouldbeweighed

crystal()grams.(ThemolarmassofNa2S2O3·5H2O

isknown248g/mol））。A4.96gB

3.16gC5.2gD0.5g第3題Toprepare1000mLof0.1mol/LHClsolution,takeconcentratedhydrochloricacid()mL.A0.84mLB8.4mLC1.2mLD12mL第4題Theconcentrationofcommerciallyavailableconcentratedhydrochloricacidis()mol/L.A6B12C18D36第5題Inordertoensuretheaccuracyoftheanalysis,thefollowingrequirementsforstandardsolutionsareunreasonable().AAccuratecalibration;BProperpreservation;CMustbematchedonthesameday,usedonthesameday;DGenerally,itmustbecalculatedto4significantdigits第6題AreagentisabbreviatedasAR.onitslabel,whichshouldbe().AExcellentgradepure;BChemicallypure;CAnalyticalpure;DBiochemicalreagents第7題Generalchemicaltestingcanmeettherequirementswith().APrimarywater;BSecondarywater;CTertiarywater;DTapwater第8題Thefollowingstatementiswrong().APrimarywatercannotbestored,preparedbeforeuse;BSecondarywaterneedstobestoredinaclosed,specialpolyethylenecontainer;CTertiarywaterisstoredinaclosedspecialpolyethylenecontainer,andcanalsobestoredinaclosedspecialglasscontainer;DChemicaltestingmustusepurewaterabovegradeIItomeettherequirements.第9題Laboratorywaterspecifiedinnationalstandardsisdividedinto()grade.A4B5C3D2第10題Standardsolutionspreparedbyindirectmethodmustuseelectronicanalyticalbalancesorpipetteequimeters.()第11題Duringthetitrationanalysis,thestandardtitrationsolutionmustbepreparedbythereferencesubstance.()第12題High-puritychemicalreagentsmustbeusedinthechemicaltestingprocess.()第13題Analyticalpurereagentscanbeusedtodirectlypreparestandardsolutions.()第14題Distilledwatercontainsmuchlessimpuritiesthantapwater,whichisrelativelypureandcanreachtheindexoffirst-classwater.()第15題Deionizedwatercanbedirectlyusedasanalyticalinspectionwaterwithstrictrequirements.()第16題Thecolorofthesecondaryreagentlabelinthechemicalreagentshouldbe().Apurple;BGreen;CRed;DBlue第17題Distilledwatercontainsmuchlessimpuritiesthantapwater,isrelativelypure,andcanreachtheindexof().APrimarywater;BSecondarywater;CTertiarywater;DHighpuritywater第18題Amongthefollowingdevices,itcannotbeusedforthepreparationoflaboratorywater().ARedistillationdevice;BDistillationunit;CIonexchangedevice;DElectrodialysisdevice第19題Chemicalreagentsecondaryproduct,thatis,analyticalpure(A.R)labelmarkedingreen.()第20題Theonlymethodsforpreparingpurewateraredistillationandionexchange.()Acid-baseprotontheoryhomework第1題Theaqueoussolutionofthefollowinganions,iftheamountandconcentrationofthesubstancearethesame,whichisthemostalkaline(

)ACN—（Ka=4.93×10－10）BS2—（Ka1=9.1×10—8，Ka2=1.1×10—12）CF—（Ka=3.53×10－4）DCH3COO—（Ka=1.76×10－5）第2題ItisknownthatthepH=3.0of0.10mol/Lmono-weakacidsolution,then0.10mol/LofitsconjugatedalkalisolutionpHis().A11.0B9.0C8.5D9.5第3題Intheconjugatedacidbase,thestrongertheacidityoftheacid,theconjugatedbase().AThemorealkaline;BAlkalinestrengthisuncertain;CTheweakerthealkalinity;DAlkalinitydisappears第4題0.1mol/Lofthefollowingsolutions,themostacidicis().AH3BO3(Ka=5.8×10-10)BNH3·H2O(Kb=1.8×10-5);C苯酚(Ka=1.1×10-10)DHAc(Ka=1.8×10-5)第5題Addsomeacidinpurewater,theninsolution().ATheproductof[H+]·[OH-]increases;BTheproductof[H+]·[OH-]decreases;CTheproductof[H+]·[OH-]doesnotchange;DThepHofthesolutionincreases第6題Neutralsolutionstrictlyrefersto().ASolutionpH=7.0;BSolutionpOH=7.0;CsolutionpH+pOH=14.0;DSolutionc(H+)=c(OH-)第7題Thefollowingstatementiswrong().AH2OasaconjugatedbaseoftheacidisOH-;BH2OasaconjugatedacidofthebaseisH3O+;CBecauseHAcishighlyacidic,thealkalinityofHAcmustbeweak;DHAcisweaklyalkaline,thenH2Ac+ishighlyacidic第8題Accordingtoprotontheory,whichofthefollowingsubstancesdoesnothaveamphoteric().AHCO3-BCO32-CHPO42-DHS-第9題Accordingtoacid-baseprotontheory,HCO3-belongsto().Aacidicsubstances;Balkalinesubstances;CneutralsubstancesDamphotericsubstances第10題Amongthefollowinggroupsofacid-basecomponents,theconjugatedacid-basepairis().AHCN-NaCNBH3PO4-Na2HPO4;C+NH3CH2COOH-NH2CH2COO-DH3O+-OH-第11題H2PO4–Theconjugatedbaseis().AHPO42–BPO43–CH3PO4DOH-第12題Theconjugatedbaseofstrongacidmustbeweak.()第13題Afteraddingacidtopurewater,theionproductofwaterwillbegreaterthan10-14.()第14題Accordingtoacid-baseprotontheory,strongacidbecomesweakacidafterreaction.()第15題Accordingtoacid-baseprotontheory,HCN-CN-isaconjugatedacid-basepair,HCNisaweakacid,andCN-isastrongbase.()第16題Accordingtoacid-baseprotontheory,dissociationreactions,hydrolysisreactionsandneutralizationreactionsinaqueoussolutionsareallprotontransportreactions.()第17題Theacid-basereactionisactuallyaprocessofprotontransfer,sotheconjugatedacidandtheconjugatedbaseareobtainedandthenumberofprotonslostmustbeequal,respectively.()第18題Accordingtoprotontheory,everythingthatcangiveprotonsisanacid,andeverythingthatcanacceptprotonsisanalkali.()第19題Inacid-baseprotontheory,itisacidthatacceptsprotons.()CalculationofpHofacid-basesolution第1題

CalculationofpHofacid-basesolutionThepHof0.04mol/LH2CO3

solutionis（）（Ka1=4.3×10-7，Ka2=5.6×10

-11）A4.73B5.61C3.89D8.68第2題KnownKHAc=1.75×PHof10-5,0.20mol/LNaAcsolutionis

A2.72B4.97C9.03D11.27第3題Toreduce

thedissociationdegree

of0.1mol/LHAc

solutionandincreasethepH,itcanbeadded

A0.1mol/LHClBSolidNaAcC

SolidNaClDH2O第4題Kb=1×10-5

ofaweakbase

MOH,thenthe

pH

ofits0.1mol/L

aqueoussolution

is

A

3.0B5.0C9.0D11第5題3.IftheHA

ofweakacid

Ka=1.0×10-5,the

pH

ofits0.10mol/L

solution

is(）。A2.00B3.00C5.00D6.00第6題6.ThepHof

0.1mol/LNH4Cl

solution

is(A).

Kb

ofammonia

=1.8×10-5A5.13B6.13C6.87D7.0第7題ThecalculationofpHofacid-basesolutioncalculatesthepHvalueofbinaryweakacids,ifKa1?Ka2,often().AOnlyfirst-orderdissociationiscalculated;BPrimaryandsecondarydissociationsmustbeconsideredsimultaneously;COnlysecond-orderdissociationiscalculated;DThefirstlevelofdissociationisignoredandonlythesecondleveldissociationiscalculated第8題ThefollowingaqueoussolutionshavethesmallestpH().ANaHCO3BNa2CO3CNH4ClDNH4Ac第9題Inasolutionof1mol/LHAc,inordertoincreasetheconcentrationofhydrogenions,whichofthefollowingmethodscanbetaken().AAddwaterBAddNaAcCAddNaOH;D0.1mol/LHCl第10題NaAcdissolvedinwater,pH().AGreaterthan7;BLessthan7;Cequals7;Dis0第11題Thereis500mLofhydrochloricacidsolutioncontainingH+of0.005molandpHofthesolution().A0B2C3D4第12題Theconcentrationof5mol/LNaOHsolutionis100mL,andthewaterisdilutedto500mL,thentheconcentrationofthedilutedsolutionis()mol/L.A1B2C3D4第13題H2SInsolution[H+]=2[S2-]。()第14題Multipleweakacidsandweakbases,becausethedissociationabilityatalllevelsisalmostthesame,soitisoftendiscussedwiththefirstlevelofdissociation.()第15題Doubletheaceticacidsolutionwithwater,theconcentrationofhydrogenionsinthesolutionwillbereducedtoone-halfoftheoriginal.()第16題Doubletheconcentrationofammonia,andtheconcentrationofOH-ionsinthesolutionisreducedtohalfoftheoriginal.()第17題Dilute1×10-5mol/LofHClsolution1000times,thepHofthesolutionisequalto8。()第18題HCl,H2SO4,NaOHandatconcentrationsof0.01mol/LTheproductofH+andOH-ionconcentrationsinthefouraqueoussolutionsofNH4Acisequal.()第19題AsolutionwithapHvaluelessthan7mustbeanacid.()第20題Thegreaterthedissociationconstantoftheacid,thelowerthepHofitsaqueoussolution.()第21題Theso