Ionic Activities from Electrochemical Cells Chemical Engineering Notes | EduRev

Chemical Engineering : Ionic Activities from Electrochemical Cells Chemical Engineering Notes | EduRev

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Ionic Activities from Electrochemical Cells
AgCl | Ag
HCl
(m)
H
2
(g)
E+2RT/F ln m
•
•
•
•
E = 0.2225 V
o -
m
1
/
2
Pt(H
2
, 1bar) | HCl(m) | AgCl | Ag
                                                                                                                                                                                                                                                                                                           
1
/
2
 H
2
 (g)  
? ‹  H
+
  + e
-
AgCl + e
-
 
? ‹  Ag + Cl
-
                                                                                                                                                                                                                                                                                                           
E = E
o -
 - 
RT
F
 ln 
 L    l    a
Ag 
a
H
+ 
a
Cl
-
a
AgCl
 a
1
/
2
H
2
                                                                                                                                                                                                                                                                                                           
E = E
o -
 - 
RT
F
 ln a
H
+ 
a
Cl
-
                                                                                                                                                                                                                                                                                                           
E = E
o -
 - 
RT
F
 ln g 2
– 
m
+
m
-
m
o -2
                                                                                                                                                                                                                                                                                                           
E = E
o -
 - 
2RT
F
 ln g – m
/
m
o -
                                                                                                                                                                                                                                                                                                           
E + 
2RT
F
 ln m
/
m
o -
  = E
o -
 - 
2RT
F
 ln g –                                                                                                                                                                                                                                                                                                           
log g – 
= -0.509 | z
+
 z
-
 | I
1
/
2 I = 
1
2
   z
2
i
 m
i
/m
o -
                                                                                                                                                                                                                                                                                                           
ln g – 
= A m
1
/
2 A = -0.509 | z
+
 z
-
 |  2.303
                                                                                                                                                                                                                                                                                                           
E + 
2RT
F
 ln m  = E
o -
 - 
2RTA
F
 m
1
/
2
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