分析化学试题及答案.docx
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分析化学试题及答案.docx
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分析化学试题及答案
分析化学试题及答案
一.填空(每空1分,共28分,答在试卷上)
1.定量分析过程包
括,,
和四个步骤.2.根据有效数字计算规则计算:
1.683+37.42,7.33?
21.4,0.056=14.4。
2-2-3.某酸HA的水溶液中,若δ为0.28,δ-=5δ,那么δ2H2AHAAA为。
2+3+4.含有Zn和Al的酸性缓冲溶液,欲在pH=5,5.5的条件下,用EDTA
2+标准溶液滴定其中的Zn,加入一定量六亚甲基四胺的作用是;加入NHF的作用是。
4
5.NaOH滴定HCl时,浓度增大10倍,则滴定曲线突跃范围增大个pH单位;若为滴定HPO,则突跃范围增大个pH单位.34
6.对于实验数据中的异常值的取舍,通常可根
据、和方法来判断。
7.莫尔法与佛尔哈德法的指示剂分别
为、。
8.紫外可见分光光度计
由,,和四部分组成.
loanmanagement(post)review:
1,approvalcriteriahavebeenimplemented;2,thecontractiscorrect;3,inlinewiththecontract,payment;4,noothermajorcasesagainstloansecurity;、Reviewedby:
dateofrecordform9:
qilubankborrowingbysingleyearsofmaximumamountamaximumno-loanborrowers:
borrowers:
...Borrowernamenumber,lineofcreditexpirydateyearmonthdaytoyearmonthdaymaximumnumberofyearsintheloancontractarethetoplineopened,theborrowedandrequestedyourbankopenedcreditlinesabove,isherebyrequested.Borrowersignature:
dateagreedtoopencreditlines.CustomerManagersignature:
dateagreedtoopencreditlines.Loanreviewsignature:
datelinecancellation-Ididnotusetheloanamount,yourbankcreditlinestobecancelled.-Creditloanprincipalrepayment,yourbankcreditlinestobecancelled.Borrowersignature:
date-unusedcreditlines,agreetowriteoffloans.-Creditloanprincipalrepayment,agreetowriteoffloans.CustomerManagersignature:
datecase,agreetowriteoffloans.Loanreviewsignature:
dateofrecordform16:
qiluselfcreditforcreditcardcancellationapplicationformnameofborrowerIDnumberandcreditlimitexpirationdateyearmonthdaytoyearmonthdayyearcontractnumberself-servicecard-Idonotusecredit,yourbankcreditlinestobecancelled.-Creditloanprincipalrepayment,yourbankcreditlinestobecancelled.Borrowersignature:
date-unusedcreditlines,agreetowriteoffloans.-Creditloanprincipalrepayment,agreetowriteoffloans.CustomerManagersignature:
9.检验两组结果是否存在显著性差异采用检验法,检验两组数据的精密度是否存在显著性差异采用检验法。
10.吸光物质的摩尔吸光系数与溶液的pH关,与波长关。
11.以波长为横坐标,吸光度为纵坐标,测量某物质对不同波长光的吸收程度,所获得的曲线称谓;光吸收最大处的波长叫做,可用符号表示。
12.光度法测定某物质,若有干扰,应根据和原则选择波长。
二.简答和名词解释(每题2分,共16分,答在试卷纸上)1.什么是准确度,什么是精密度,
2+2.用KCrO溶液滴定Fe试液时,常向溶液中加入HPO,为什么,227343.已知滴定管的读数标准偏差为0.01mL,若滴定时耗去30.00mL溶液,则该溶液体积的相对标准偏差为多少,
4写出浓度为cmol/L(NH)CO溶液的质子条件式。
423
5.摩尔吸光系数
6.下图是薄层色谱分离物质的色谱图,根据图写出R值计算式。
f
loanmanagement(post)review:
1,approvalcriteriahavebeenimplemented;2,thecontractiscorrect;3,inlinewiththecontract,payment;4,noothermajorcasesagainstloansecurity;、Reviewedby:
dateofrecordform9:
qilubankborrowingbysingleyearsofmaximumamountamaximumno-loanborrowers:
borrowers:
...Borrowernamenumber,lineofcreditexpirydateyearmonthdaytoyearmonthdaymaximumnumberofyearsintheloancontractarethetoplineopened,theborrowedandrequestedyourbankopenedcreditlinesabove,isherebyrequested.Borrowersignature:
dateagreedtoopencreditlines.CustomerManagersignature:
dateagreedtoopencreditlines.Loanreviewsignature:
datelinecancellation-Ididnotusetheloanamount,yourbankcreditlinestobecancelled.-Creditloanprincipalrepayment,yourbankcreditlinestobecancelled.Borrowersignature:
date-unusedcreditlines,agreetowriteoffloans.-Creditloanprincipalrepayment,agreetowriteoffloans.CustomerManagersignature:
datecase,agreetowriteoffloans.Loanreviewsignature:
dateofrecordform16:
qiluselfcreditforcreditcardcancellationapplicationformnameofborrowerIDnumberandcreditlimitexpirationdateyearmonthdaytoyearmonthdayyearcontractnumberself-servicecard-Idonotusecredit,yourbankcreditlinestobecancelled.-Creditloanprincipalrepayment,yourbankcreditlinestobecancelled.Borrowersignature:
date-unusedcreditlines,agreetowriteoffloans.-Creditloanprincipalrepayment,agreetowriteoffloans.CustomerManagersignature:
7.光度分析中,当浓度较高时,工作曲线逐渐偏离直线,这是什么原因,
8.在螯合物萃取体系中,影响液-液萃取分离的因素有哪些,
三.回答问题(每题4分,共24分,答在试卷纸上)
1.为满足重量分析的要求,晶型沉淀的沉淀条件是什么,并简述其原因。
2已知lgK=18.8,lgK=10.7,lgK=16,试说明为何可以CuY-PANCuYCaYCu-PAN
为指示剂,指示Ca的滴定?
3.质子化氨基乙酸的pK和pK分别为2.3和9.6,能否用NaOH滴a1a2
定氨基乙酸,为什么,
4.利用显色剂显色络合反应分光光度法测定无机离子时,影响显色反应的因素有哪些?
5.在721型吸光光度计上读数刻度示意图如下:
loanmanagement(post)review:
1,approvalcriteriahavebeenimplemented;2,thecontractiscorrect;3,inlinewiththecontract,payment;4,noothermajorcasesagainstloansecurity;、Reviewedby:
dateofrecordform9:
qilubankborrowingbysingleyearsofmaximumamountamaximumno-loanborrowers:
borrowers:
...Borrowernamenumber,lineofcreditexpirydateyearmonthdaytoyearmonthdaymaximumnumberofyearsintheloancontractarethetoplineopened,theborrowedandrequestedyourbankopenedcreditlinesabove,isherebyrequested.Borrowersignature:
dateagreedtoopencreditlines.CustomerManagersignature:
dateagreedtoopencreditlines.Loanreviewsignature:
datelinecancellation-Ididnotusetheloanamount,yourbankcreditlinestobecancelled.-Creditloanprincipalrepayment,yourbankcreditlinestobecancelled.Borrowersignature:
date-unusedcreditlines,agreetowriteoffloans.-Creditloanprincipalrepayment,agreetowriteoffloans.CustomerManagersignature:
datecase,agreetowriteoffloans.Loanreviewsignature:
dateofrecordform16:
qiluselfcreditforcreditcardcancellationapplicationformnameofborrowerIDnumberandcreditlimitexpirationdateyearmonthdaytoyearmonthdayyearcontractnumberself-servicecard-Idonotusecredit,yourbankcreditlinestobecancelled.-Creditloanprincipalrepayment,yourbankcreditlinestobecancelled.Borrowersignature:
date-unusedcreditlines,agreetowriteoffloans.-Creditloanprincipalrepayment,agreetowriteoffloans.CustomerManagersignature:
问:
(1)图中的字母T、A分别代表什么,
(2)图中上面的刻度代表什
么,下面的刻度代表什么,(3)下面的刻度为什么不均匀,
6.分析化学中常用的分离和富集方法有哪些?
(回答不能少于8种方
法)
四.计算题(每题8分,共32分,答在试卷纸上)
1.计算pH=4.0,含有0.1000mol/L的草酸溶液和0.0100mol/LEDTA
-9的溶液中CaCO的溶解度(KCaCO=2.0,10,lgK=10.69,草酸24sp24CaY
的解离常数为pKa=1.23,pKa=4.19,pH=4.0时lg,=8.44)12Y(H)
2.称取0.2357gSbS试样,让其燃烧,产生的SO用FeCl溶液吸收.2323
-12+然后用0.002000mol.LKMnO溶液滴定溶液中生成的Fe,消耗4
KMnO30.20mL,求试样中Sb的质量分数.(已知Mr(Sb)=121.7g.4
-1mol)
3.在pH=5.0的缓冲溶液中,以二甲酚橙(XO)为指示剂,用0.020
2+2+mol/LEDTA滴定浓度均为0.020mol/L的Cd和Zn混合溶液中的
2+,Zn,加入过量的KI,使其终点时的[I]=1.0mol/L。
试通过计算
2+2+判断Cd是否产生干扰,能否用XO作指示剂准确滴定Zn,(已知
2,pH=5.0时,lgK,=4.5,lgK,=4.8;CdI的lg,,lg,为CdInZnIn414
2.10,3.43,4.49,5.41;lgK=16.5,lgK=16.64。
要求TE,ZnYCdY
0.3%,,pM=,0.2。
)
loanmanagement(post)review:
1,approvalcriteriahavebeenimplemented;2,thecontractiscorrect;3,inlinewiththecontract,payment;4,noothermajorcasesagainstloansecurity;、Reviewedby:
dateofrecordform9:
qilubankborrowingbysingleyearsofmaximumamountamaximumno-loanborrowers:
borrowers:
...Borrowernamenumber,lineofcreditexpirydateyearmonthdaytoyearmonthdaymaximumnumberofyearsintheloancontractarethetoplineopened,theborrowedandrequestedyourbankopenedcreditlinesabove,isherebyrequested.Borrowersignature:
dateagreedtoopencreditlines.CustomerManagersignature:
dateagreedtoopencreditlines.Loanreviewsignature:
datelinecancellation-Ididnotusetheloanamount,yourbankcreditlinestobecancelled.-Creditloanprincipalrepayment,yourbankcreditlinestobecancelled.Borrowersignature:
date-unusedcreditlines,agreetowriteoffloans.-Creditloanprincipalrepayment,agreetowriteoffloans.CustomerManagersignature:
datecase,agreetowriteoffloans.Loanreviewsignature:
dateofrecordform16:
qiluselfcreditforcreditcardcancellationapplicationformnameofborrowerIDnumberandcreditlimitexpirationdateyearmonthdaytoyearmonthdayyearcontractnumberself-servicecard-Idonotusecredit,yourbankcreditlinestobecancelled.-Creditloanprincipalrepayment,yourbankcreditlinestobecancelled.Borrowersignature:
date-unusedcreditlines,agreetowriteoffloans.-Creditloanprincipalrepayment,agreetowriteoffloans.CustomerManagersignature:
4.某矿石含铜约0.12,,用双环己酮草酰二腙显色光度法测定。
试样溶解后转入100ml容量瓶中,在适宜条件下显色,定容.用1cm比色皿,在波长600nm测定吸光度,要求测量误差最小,应该称取试样多
4-1-1-1少克,ε,1.68×10(L?
mol?
cm),Mr(Cu)=63.5g.mol)
答案:
一.填空(每空1分,共28分,答在试卷上)
1.定量分析过程包括取样,试样分解,
分离测定和分析结果计算及评价四个步骤。
2.根据有效数字计算规则计算:
1.683+37.42,7.33?
21.4,0.056=14.4。
2-2-3.某酸HA的水溶液中,若δ为0.28,δ-=5δ,那么δ为2H2AHAAA0.12。
2+3+4.含有Zn和Al的酸性缓冲溶液,欲在pH=5,5.5的条件下,用EDTA
2+标准溶液滴定其中的Zn,加入一定量六亚甲基四胺的作用是控制
3+酸度;加入NHF的作用是消除Al干扰,起掩蔽作用。
4
5.NaOH滴定HCl时,浓度增大10倍,则滴定曲线突跃范围增大2个pH单位;若为滴定HPO,则突跃范围增大0个pH单位.34
6.对于实验数据中的异常值的取舍,通常可根据4d法、Q检验法和Grubbs法方法来判断。
7.莫尔法与佛尔哈德法的指示剂分别为铬酸钾(KCrO)、铁铵钒24(NHFe(SO))。
442
loanmanagement(post)review:
1,approvalcriteriahavebeenimplemented;2,thecontractiscorrect;3,inlinewiththecontract,payment;4,noothermajorcasesagainstloansecurity;、Reviewedby:
dateofrecordform9:
qilubankborrowingbysingleyearsofmaximumamountamaximumno-loanborrowers:
borrowers:
...Borrowernamenumber,lineofcreditexpirydateyearmonthdaytoyearmonthdaymaximumnumberofyearsintheloancontractarethetoplineopened,theborrowedandrequestedyourbankopenedcreditlinesabove,isherebyrequested.Borrowersignature:
dateagreedtoopencreditlines.CustomerManagersignature:
dateagreedtoopencreditlines.Loanreviewsignature:
datelinecancellation-Ididnotusetheloanamount,yourbankcreditlinestobecancelled.-Creditloanprincipalrepayment,yourbankcreditlinestobecancelled.Borrowersignature:
date-unusedcreditlines,agreetowriteoffloans.-Creditloanprincipalrepayment,agreetowriteoffloans.CustomerManager
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