20、浓度为0.10mol/L 硼砂水溶液的质子条件是 ················································ （ ）
??A.[H]=[H2BO3]－[OH] B.[H+]=[OH]+[H2BO3]－[Na+]
＋
－
??C.[H]=[OH]+[H2BO3]－[H3BO3] D.[H+]=[OH]－0.2+[H2BO3]
＋
－
－
21、浓度为cmol/L的Na2C2O4中Na的物料平衡是 ··········································· （ ）
A.[Na]=c B.[Na]=2c C.[Na+]=
＋
＋
＋
1c 2?D.[Na]=2（[H2C2O4]+[HC2O4] +[C2O24] ）
＋
－
22、浓度为0.020mol/L的NaHSO4（Pka2=2.0）溶液的pH是 ···························· （ ）
A.4.0 B.3.0 C.2.0 D.1.0
23、浓度为0.10mol/L的NH2OH·HCl （pKb=8.04）溶液的pH是 ················· （ ）
A.3.96 B.2.96 C.1.96 D.0.96
24、浓度为0.10mol/L的NH2OH·HCl（pKb=8.04）溶液的pH是 ··················· （ ）
A.4.45 B.3.48 C.10.58 D.12.58
25、0.10mol/L Na3PO4（pKa1=2.12，pKa2=7.20，pKa3=12.36）溶液pH值为 ··· （ ）
A.11.58 B.9.58 C.10.58 D.12.58
26、0.10mol/L (NH4)2CO3溶液（NH3的pKb=4.74，pKa1=6.38，pKa2=10.25）pH值是
························································································································ （ ） A.7.18 B.9.18 C.8.18 D.10.18
27、0.010mol/L（NH4）2S（pKa1=6.38，pKa2=14.15，NH3PKb=4.74）溶液pH值是
························································································································ （ ） A.7.25 B.8.25 C.9.25 D.10.25
28、0.10mol/L Na2HPO4(pKa1~pKa3分别为2.12，7.20，12.36)溶液的pH值是（ ）
A.8.8 B.9.8 C.10.8 D.11.8
29、浓度为0.010mol/L氨基乙酸（pKa1=2.35， pKa2=9.60）溶液的pH值是（ ） A.3.9 B.4.9 C.5.9 D.6.9
30、(NH3+NaOH)混合组分的质子条件是 ····························································· （ ）
A.[OH]=[H+]+[NH4]+[Nc+] B.[OH]=[H+]+[NH4]
－
－
??C.[OH]=[H+]+[Na+] D.[H+]=[OH]－[NH4]－[Na+]
－
－
?31、浓度为cmol/L的H2SO4和HCOOH混合液的质子条件是 ··························· （ ）
13
A.[H+]=[OH]+[HSO4]+[SO4+[HCOO]
－
－
?2?B.[H+]=[OH]+C+[SO4]+[HCOO]
－
－
2?C.[H+]=[OH]+[HSO4]+2[SO4]+[HCOO]
－
－
?2?D.[H+]=[OH]+[HSO4]+2[SO4]
－
?2?32、用NaOH滴定H3PO4（pKa1~ pKa3分别为2.12，7.20，12.36）至第二计量点，pH值
为 ···················································································································· （ ） A.10.7 B.9.7 C.8.7 D.7.7
33、含0.100mol/LHAc (Ka=1.8×105)－0.0020mol/L NaAc溶液的pH值 ·········· （ ）
－
A.5.17 B.2.17 C.4.17 D.3.17
34、100ml 0.10mol/LHCl 溶液pH由1.0增到4.44时，需加固体NaAc的克数（忽略体
积变化）是 ····································································································· （ ） A.4.23 B.2.23 C.1.23 D.0.23
35、六次甲基四胺（pKb=8.83）配成缓冲溶液的pH缓冲范围是 ······················ （ ） A.8~10 B.4~6 C.6~8 D.3~5
36、欲配制pH=5的缓冲溶液，下列物质可用的是 ············································· （ ）
A.HCOOH（pKa=3.45） B.六次甲基四胺（pKb=8.85） C.NH3水（pKb=4.74） D.HAc(pKa=4.74)
37、强酸滴定弱碱应选用的指示剂是 ··································································· （ ）
A.酚酞 B.百里酚酞 C.甲基红 D.百里酚蓝
38、浓度均为1.0mol/LHCl滴定NaOH溶液的突跃范围是pH=3.3~10.7。当浓度改为
0.010mol/L时，其滴定突跃范围是 ······························································· （ ） A.11.7~2.3 B.8.7~5.3 C.9.7~4.3 D.7.7~6.3
39、下面0.10mol/L的酸不能用NaOH作直接滴定分析 ····································· （ ）
A.HCOOH（pKa=3.45） B.H3BO3(pKa=9.22) C.NH4NO3（pKb=4.74） D.H2O2(pKa=12)
40、下列0.1mol/L多元酸（碱）或混合酸（碱）中，能分步（分别）测定的是 ································································································································ （ ）
A.H2SO4（pKa2=2.0）
14
B.H2C2O4(pKa1=1.22， pKa2=4.19)
C.H3PO4(pKa1=2.2， pKa2=7.02， pKa3=12.36) D.H2S(pKa1=8， pKa=15) E.HCl－H3BO3(pKb=9.22) F.HCl－NH4Cl(pKb=4.74) G.HCl－HAc(pKa=4.74)
41、用0.10mol/L的NaOH滴定0.10mol/L，pKa=4.0的弱酸，其pH突跃范围是7.0－9.7。
用同浓度的NaOH滴定pKa=3.0的弱酸时，其突跃范围将是 ····················· （ ） A.6.0~7.0 B.6.0~9.7 C.7.0~10.7 D.8.0~9.7
42、NaOH滴定H3PO4(pKa1~ pKa3分别为2.12，7.20，12.36)至产物为Na2HPO4，应选用
的指示剂是 ····································································································· （ ） A.甲基橙 B.甲基红 C.酚酞 D.百里酚酞
43、有NaOH磷酸盐混合碱，以酚酞为指示剂，用HCl滴定耗去12.84ml。若滴到甲基
橙变色，则需HCl 20.24ml。此混合物的组成是 ·········································· （ ） 44、某生以甲基橙为指示剂用HCl标准液标定含CO3的NaOH溶液，然后用此NaOH
测定试样HAc的含量，则HAc含量将会····················································· （ ） A.偏高 B.偏低 C.无影响
45、下面混合液能出现两个滴定突跃的是 ··························································· （ ）
A.HCl－HAc(pKa=4.74) B.HAc－HF(pKa=3.18)
C.HCl－H3PO4(pKa1=2.12， pKa2=7.20， pKa3=12.36) D.HCl－H2C2O2(pKa1=1.22， pKa2=4.19)
46、Pb3O4处理成Pb（NO3）2溶液，通H2S至饱和，过滤，滤液用NaOH标液滴定，则
Pb3O4与NaOH的物质的量的比是 ································································ （ ） A.1:3 B.3:1 C.1:6 D.6:1
47、铵盐在催化剂存在下氧化为NO，再氧化为NO2，溶于水得NHO3，用NaOH滴定
时，NH4和NaOH的物质的量的比是 ·························································· （ ） A.3:1 B.1:3 C.3:2 D.2:3
?2? 15
48、能使H3BO3，HAc， HCl， H2SO4，HNO3，HClO4显示相同强酸度的溶剂是 ································································································································ （ ）
A.丙酮 B.纯水 C.液氨 D.甲基异丁酮 49、25.00ml 0.400mol/L的H3PO4溶液与30.00ml 0.500mol/L的Na3PO4溶液混合。稀至
100ml。计算pH值和缓冲容量β。取上述溶液25.00ml，问需加入多少 ml 1.00mol/LNaOH溶液，才能使溶液的pH=9.00。
50、用0.200mol/L NaOH滴定0.200mol/L HCl－0.0200mol/L HAc混合溶液中的HCl，问
计量点为pH为多少？以甲基橙为指示剂，滴定的终点误差为多少？
51、浓度均为0.100mol/L的氨基磺酸及其钠盐缓冲溶液的pH为多少？已知pKa=0.65。 52、需加入多少毫升0.10mol/L NaOH到30.00毫升0.10mol/L H3PO4中，才能得到pH=7.20
的溶液，已知H3PO4的pKa1=2.12， pKa2=7.20， pKa3=12.36。
53、配制pH=10.0的弱碱BOH（pKb=4.30）及其盐BCL的200毫升缓冲溶液向其中加
入60毫升1.0mol/L HCl后，pH=9.00，求cBOH和cBCl。
54、已知CCl3COOH的pKa=0.64，今称取其试样16.24克（M=162.4），加入2.0克NaOH
配制1000毫升溶液。问:（1）有人说此溶液pH=0.64，对否？实际pH为多少？（2）欲配制pH=0.64该溶液，需加入强酸多少？
55、甲基橙的理论变色点pH=3.4，加入NaCl使浓度达0.10mol/L，这时甲基橙的理论变
色点又为什么？
56、称取纯H2A 0.3658g，溶解后，用0.09540mol/L 的 NaOH进行电位滴定，出现两个
突跃，得到下表数据，计算机H2A的摩尔质量和pKa1、pKa2。
加入NaOHml 18.42 36.84(sp1) 55.25 73.66
计算H2A的摩尔质量和pKa1、pKa2。
57、用蒸馏法测定铵盐时，NH3用饱和H3BO3吸收，后用HCl标准溶液滴定。问选用什
么指示剂？能否用HAc代替H3BO3？
pH 2.85 4.26 5.66 8.50 16
