Oxidation-reduction titration

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????
??????? Oxidation-reduction titration
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1???????????? 2??????????? 3??????????????,??????
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1?????????? 2???????????? 3????????????????
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1????? 2?????? 3????? 4??????
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????NERNST???
1. ?????
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2. ?????
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3.???????
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• (??????????)???

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?????,????????????1moL/L??????
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Ce4/Ce3 HCl (1mol/L)
1.28 H2SO4 (0.5mol/L) 1.44 HNO3
(1mol/L) 1.61 HClO4 (1mol/L)
1.70
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???????????
1.????(???) 2.???? 3.????? 4.???
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1. ????(???)
2. ????
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3. ?????
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??
???????Cu2
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4. ???
?
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???????????
1. ??????????????? ????????K
??????K(??????)
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2. ????SP?????????? gt 99.9

• 11???

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• 12???

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?????????????
1. ??????? ????,????,??????
1)??????????????? 2)???????,????
3)????????????? 4)????,???????????
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2. ??????????????
3. ?????????,???? ???10?
,????23?

• 4. ?????????,????

??Mn2????,?????????? ????????,?????Mn2???????(?
?????)
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1?????
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2????????????
3???????????????(????)
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????
?????????0.1
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??
??????
KMnO4
??????
??
I3-
????????
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• ???????
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• ??????????
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??????????
1????
??I2?????I-?????????????
?pH lt 9 ?,??????,????????
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1??????(???)
??I2????????????
??S2-,Sn(?),S2O32-,SO32- ,???C
????????
?????I-???????????????????????? ?????I2??????
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2??????(???)
???????

• ??MnO4-,Cr2O7-,CrO4-,AsO43-,BrO3-,
• IO3-,H2O2,ClO-,Cu2

??????????
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• ?????S2O32-??????????
• I-??????????
• ???? I-?S2O32-?????,?????

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??????????
1?????
?? 1)????KI??,????
????,???? 2)?????? 3)????????(???,??) 4)??
??????
2???????(?????)
?? 1)??????(??) 2)????(????) 3)I2????????? 4)????
???(NO3-,NO,Cu2)
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???????????
1.Na2S2O3??
A.?? ????? a.?????CO2??Na2S2O3?? S2O32-
CO2 H2O ? HSO3- HCO3- S? b.????2S2O32-
O2 ?SO42- S? c.??????? S2O32- ?Na2SO3
S? ?????????,??NaCO3? pH910,
??78?,??
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B.??

• K2CrO7??????
• I2?????

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2.?????

• A.?? ??,??I-?I2(?????????)
• B.??
• As2O3???????
• NaS2O3???????

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?????
??????????? ???? ??????????(????????)
??????????(???????) ????

• ????????????????,????I2, ??????

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?????
1?????? ? Vc???
2?????? 1)????? ?????? 2)????? ????????
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2?KMnO4?
1.????MnO4-??????????????

• ???????H2SO4 ,???HCl?HNO3

??KMnO4??? ??????????
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2.KMnO4????????
(1)????? (2)?????AS2O3,H2C2O42H2O ,???,
Na2C2O4(??,???,??),H2C2O42H2O
(3)????????
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3.??
(1)????Fe2,C2O42-,As(?),H2O2
(2)????MnO2,PbO2 (3)??????????????????
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3?K2Cr2O7?
??
??HCL(??CL-??????) ??K2Cr2O7??,???????,????
?????????? ????Fe2
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4?????????
1.????
2.???
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3.?????Ce4???????????? 4.???????????????????
5.???????????????????
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