(ELECTROCHEMICAL ENGINEERING)

Chapter 2.

2.1

2.2 Nernst-Einstein

2.3 Einstein and Stokes-Einstein

2.4

2.5

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2.1

()Conductivity25S/cm()Resistivity (electric conductivity)

(1).

(2).

(3).

3

T;

4

2.2 Nernst-Einstein

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Perrin (0.29m)

(Jean Perrin)(colloidal particles)

()(chemical potential) mc c0x=0xP(x,t)

Nernst- Einstein Equation

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2.3 Einstein and Stokes-Einstein

R(t)x

av(Stokes)

Nernst-Einstein Equation Stokes-Einstein equation

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2.4

E=E0-(2.303RT/nF)*logQ

EE0

R8.314T

QaA+bBcC+dD

Q=[C]c[D]d/[A]a[B]b

Ag+(aq)+e-Ag(S)E0=+0.80V ([Ag+]=1.0M)

[Ag+]=0.2ME=E0-(0.0592/n)logQ

=0.80-(0.0592/1)log(1/0.2)=0.7586V

[Ag+]=2.0ME=E0-(0.0592/n)logQ

=0.80-(0.0592/1)log(1/2)=0.8178V

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electromotive forcehalf-cell

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10

(E) EE

(): Zn(s) Zn2+ (aq) + 2e E = 0.76 V (): Cu2+(aq) + 2e Cu(s) E = 0.34 V : Zn(s) + Cu2+(aq) Zn2+ (aq) + Cu(s) E = 1.10 V

(1).0.5MKNO3

(2).3

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:

(1).

(2).

12

:

(1).

(2).

(3).Zn-Cu

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2.5

:

(Wheatstone)(ohm)(mho)

mho1 mho/cm

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(Conductivity)()(SO42-Cl-NO3-CO32-HCO3-)

15

16

11 cm21 cm

kmho / cm = 25 km = t

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(PRINCIPLES AND APPLICATIONS OF ELECTROCHEMISTRY) ::D.R.Crow

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