For the ff. write the half-reactions, over-all reaction and Nerst equation: a. Microbial Fuel Cell b....
For the ff. write the half-reactions, over-all reaction and Nerst equation:
a. Microbial Fuel Cell
b. Alkaline battery
c. Ni-Cd battery
Homework Answers
Microbial fuel cell.
Acetate fuel cell.
Anode reaction :
CH3COO- (aq) + 2H2O(l) - 8e
2CO2 (g) + 7H+ (aq)
Cathode reaction :
O2 (g) + 4 H+ (aq) + 4e
2 H2O (l)
Overall reaction
CH3COO- (aq) + H+
(aq) + 2 O2 (g)
2CO2 (g) + 2 H2O (l) .
Nernst equation :
E = Eo - 
log 
Acrivity of liquid is one.
Alkaline battery
Anode reaction
Zn (s) + 2 OH- (aq)
Zn(OH)2 (s) + 2e
Cathode reaction :
2MnO2 (s) + H2O (l) + 2e
Mn2O3 (s) + 2OH- (aq)
Overall reaction :
Zn (s) + 2 MnO2 (s) +
H2O(l)
Zn(OH)2 (s) + Mn2O3 (s) .
Nernst equation
E = Eo - 
log Q
Q is constant. As all reactants and products are either solid or liquid.
C.
Ni/Cd battery.
Anode reaction :
Cd (s) + 2OH- (aq)
Cd(OH)2 (s) + 2e
Cathode reaction :
NiO(OH) (s) + H2O (l) + e
Ni(OH)2 (s) + OH- (aq)
Overall reaction :
Cd(s) + 2 NiO(OH) (s) + 2 H2O (l)
Cd(OH)2 (s) + 2 Ni(OH)2 (s) .
Nernst equation :
E = Eo -
log Q
Q is constant as reactant and product is either solid or liquid.
Add Answer to:
For the ff. write the half-reactions, over-all
reaction and Nerst equation:
a. Microbial Fuel Cell
b....
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