. The Nickel-Cadmium cell (a.k.a. nicad battery) powers environmental hazard bec

Question

. The Nickel-Cadmium cell (a.k.a. nicad battery) powers environmental hazard because of cadmium's razors, and power tools. Disposal of these batteries poses an toxicity. Thus, it is encouraged that half-reactions ar s recycle these batteries, rather than dispose of them in landfills. The following e used in a nicad battery: E +0.81 v B'--0.49 V a) What is the purpose of a galvanic cell? cactians to e tuses Write the half-reaction that occurs at each electrode (anode and cathode). c) Write the equation for the overall cell reaction. d) What is the maximum voltage that this cell can produce?

Explanation / Answer

a) purpose of a galvanic cell:

Spontaneous redox reactions taking place in the cathode-anode combination of a cell to generate electricity

b)Standard reduction potential of Ni3+/Ni2+ ,Eo(red) =+0.81V>> Eo(red) =-0.49V of Cd2+/Cd

So, Ni3+/Ni2+ will be cathode,

At cathode reduction takes place:

half -cell rxn

Ni3+(aq) +e- <---->Ni2+(aq)

At anode : oxidation half -rxn:

Cd(s) <---->Cd2+(aq)+2e-

c)overall cell rxn:

Ni3+(aq) +e- <---->Ni2+(aq)]*2

Cd(s) <---->Cd2+(aq)+2e-

--------------------------------------------

2Ni3+(aq) + Cd(s) <--->2Ni2+(aq) + Cd2+(aq) (overall rxn)

d)Eocell=maximum voltage=Eo(red)cathode-Eo(red) anode=+0.81V-(-0.49V)=+1.3V

Eo(cell)=+1.3V

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