
A galvanic cell with E°cell = 0.30 V can be constructed using an iron electrode in a 1.0 M Fe(NO3)2 solution, and either a tin electrode in a 1.0 M Sn(NO3)2 solution, or a chromium electrode in a 1.0 M Cr(NO3)3 solution—even though Sn2+/Sn and Cr3+/Cr have different standard reduction potentials. Explain and give the overall balanced reaction for each cell.

Interpretation:
To explain the balanced cell reaction of two galvanic cells constructed through the combination of
Concept introduction:
Galvanic cell is an experimental set up used to generated electricity through spontaneous redox reaction. The cell works on the principle of oxidation (anode) and reduction (cathode), taking place simultaneously in a separately location with the transfer of electron between them through an external wire. The standard potential of the electrodes (Eo) were measured in relative with standard hydrogen electrode (SHE) at standard temperature and pressure with electrolyte concentration of 1M and it was tabulated.
In this case two galvanic cells were constructed through the combination of
Answer to Problem 2PPB
Cell-1:
First let us discuss the cell made up of
Then Ecell of the reaction was calculated as follows
Cell-2:
The combination of
Charges in the above reaction are unbalanced. In order to balance the charges, oxidation and reduction half need to be multiplied by a whole number as given below.
Then Ecell of the above reaction can be calculated as follows
Explanation of Solution
Cell-1:
First let us discuss the cell made up of
Then Ecell of the reaction was calculated as follows
Cell-2:
The combination of
Charges in the above reaction are unbalanced. In order to balance the charges, oxidation and reduction half need to be multiplied by a whole number as given below.
Then Ecell of the above reaction can be calculated as follows
In the cell-1, Fe act as anode due to low standard reduction potential than Sn, but in case of cell-2 Fe act as cathode, since the standard reduction potential of Cr is lower than Fe. Even though Sn and Cr have different standard reduction potential, coupling with iron resulted in the same standard cell potential.
Balanced equation of the two cells with same standard potential made up of two combination, such as
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Chapter 18 Solutions
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