ELECTROCHEMISTRY
Introduction
Important Topics
Overview of the Chapter
A button cell used in watches functions as following
Zn(s) + Ag2O(s) + H2O(l) 2Ag(s) +
Zn2+(aq) + 2 OH-(aq)
If half cell potentials are
Zn2+ (aq) + 2 e- Zn(s); E° = -0.76V
E° = 0.34 V
The cell potential will be:
1.34 V
1.10 V
0.42 V
0.84 V
The molar conductivity of a 0.5 mol/dm3 solution of AgNO3 with electrolytic conductivity of 5.76 x 10-3 S cm-1 at 298 K is
2.88 S cm2/mol
11.52 S cm2/mol
0.086 S cm2/mol
28.8 S cm2/mol
When 0.1 mol is oxidised the quantity of electricity required to completely oxidise to is :
96500 C
2 96500 C
9650 C
96.50 C