Interpretation:
Voltage for Down’s cell is to be calculated.
Concept introduction:
Electrode potential is capacity of electrode to gain or lose electron when it is dipped in solution of its own ions. The absolute magnitude of cell potential of an electrode cannot be determined as oxidation half reaction or reduction half reaction cannot occur alone.
Down’s cell is the cell in which
Answer to Problem 28SSC
Voltage for Down’s cell that is
Explanation of Solution
When molten
The overall reaction for Down’s cell is:
The half cell reactions are as follows:
As per the latest convention of sign, the electrode at which reduction occurs with respect to standard hydrogen electrode is assigned positive sign or has higher reduction potential and the electrode at which oxidation occurs with respect to standard hydrogen electrode is assigned negative sign or has lower reduction potential.
As per table 20.1, standard potential for the half cell reactions are as follows:
Since chlorine has positive electrode potential then sodium so reduction of chlorine and oxidation of sodium occur.
The formula for cell potential is as follows:
Where,
Substitute
Voltage for Down’s cell that is
Voltage for Down’s cell that is
Chapter 20 Solutions
Chemistry: Matter and Change
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