Grade 12Physical Chemistry
calcu;late EMF of the cell A/A3+(0.1m)// B2+(0.01m)/Bgiven Eo A/A3+=0.75VEo B/B2+= 0.45V
calcu;late EMF of the cell
A/A3+(0.1m)// B2+(0.01m)/B
given Eo A/A3+=0.75V
Eo B/B2+= 0.45V
1 Answer
Naveen Kumar
The half cell reactions can be written as: A............>...A3+(0.1M)..+3e-................(1)
at anode
and for cathode, B2+(0.01M)........+2e-................>B.............(2)
For balencng the e4quations multiply (1) with 2 and (2) with 3 and add both.
Now calculate free energy change for individual haifs and then add the free energy change.
First calculate E by using formula E=Eo-0.0591/n *logQ
where Q=reaction quotient=[A3+] for equation (1) and 1/[B2+] for equation(2).and now calculate deltaG value for the half reactions.
deltaG=-nFE, where n-=number of electrons involved
and after adding the delta G again use the same formula to get the value of E for the overall reaction.
at anode
and for cathode, B2+(0.01M)........+2e-................>B.............(2)
For balencng the e4quations multiply (1) with 2 and (2) with 3 and add both.
Now calculate free energy change for individual haifs and then add the free energy change.
First calculate E by using formula E=Eo-0.0591/n *logQ
where Q=reaction quotient=[A3+] for equation (1) and 1/[B2+] for equation(2).and now calculate deltaG value for the half reactions.
deltaG=-nFE, where n-=number of electrons involved
and after adding the delta G again use the same formula to get the value of E for the overall reaction.
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