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第十二章 电导分析法 PowerPoint PPT Presentation


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第十二章 电导分析法. 电解质溶液能导电,当溶液中离子浓度发生变化时,其导电能力亦随之改变。依据溶液电导的变化来指示溶液中离子浓度的变化,就形成了 电导分析法( conductometric analysis )。. 电导分析法可以分成两种: 电导法( conductometry ) 电导滴定法( conductometric titration )。. 第一节 电导的基本概念. 一、电导、电导率和摩尔电导率. 1. 电导和电导率. 当两个铂电极插入电解质溶液中,并在两电极上施加一定的电压,此时就有电流流过回路。 电流是电荷的移动, 在金属导体中 靠自由电子的定向移动,

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第十二章 电导分析法

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conductometric analysis


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conductometry

conductometric titration


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1.


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1.

G

RS


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1.


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1.

  • S/cml cmA cm2

    1 cm1 cm2

    1 cm3 1 cm


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  • l /Acm1


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1

2

3


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2.


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2.

1 mol 1 cm

1 mol Vcm3S/cmm


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2.

cmol/L

Scm2/mol


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1 cm31 mol


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3.0

0


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3.0


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3.0

621/2Ca2+1/3Fe3+1 mol1/2Ca2+1 mol1/3Fe3+


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61 25

H2O H OH 107 mol/L62H 0+ 349.82OH 0- 197.6


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50 Hz10002500 Hz610 V


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Rx

R3

N

R2

R1

Wheatstone

R1R2R1/R2R3RxR1/R2R3N


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Wheatstone

R1/R2R3RxG


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1

2

3

4

RX

Em

Rm

E


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l /Acm1


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A l G


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KCl63 25


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10 S/cm


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1.


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1.


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621


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2. SO2

SO2SO2H2O2SO2H2SO4


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SO2


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3. DO

DOTl


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3. DO

0.035 S/cm1 g/ml


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4.

IC2070gng


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4.

2080


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K=10-10


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Hcl hoac

d

a

b

V1

V2

b

NaOH(ml)

HClHOAc

V1HClNaOH

V2V1HOAcNaOH


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1.

2.

3.


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