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第五章 库仑分析法 ( 自学内容) PowerPoint PPT Presentation


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第五章 库仑分析法 ( 自学内容). §5-1 法拉第电解定律及库仑分析法概述 一、法拉第电解定律:是指在电解过程中电极上析出的物质的量与通过电解池的电量的关系,即: ( 1 )于电极上发生反应的物质的质量与通过该体系的电量成正比; ( 2 )通过同量的电量时电极上所沉积的各物质的质量与各该物质的 M/n 成正比。 上述关系亦可用下式表示:. 式中. 因此利用电解反应来进行分析时: ( 1 )可称量在电极上析出物质的质量(电重量分析) ( 2 )也可测量电解时通过的电量,再由上式计算反应物质的量,即为库仑分析。.

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第五章 库仑分析法 ( 自学内容)

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4199558

(

5-1

1

2M/n


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1

2


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1.2.100%

1.

2.


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5-2


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5-2

EaEcacURi


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0.01mol/L1mol/LAg+Cu2+

Ag+Ag

Ag+ + e

Ag


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[H+]=1mol/L,1.23V0.47V5-2iRR


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1.02VAg+

[Ag+]=10-7mol/L

Ag+0.682V0.386V1.02V1.31V


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1mol/LCu2+

1.35VCu2+


4199558

1.35VCu2+Ag+


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6-3


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1.

2.pH


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0.03mol/LKBr0.2mol/LK2SO4(

pHOH-pH


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0.5mol/LK2SO4Na2SO4,,,0.1742mL


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6-4

100%

1..

2.


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Fe2+

100%Fe3+Fe2+

Fe2+Fe3+


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Fe2+100%

100%

Ce3+Fe2+

Fe2+Fe3+Ce3+Ce4+


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Ce4+Fe2+

Ce3+Ce3+Ce4+Fe2+Fe3+Fe2+Fe3+


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mg


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1..

2.


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