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Using the reactivity series above, answer the following questions for each cell.

a) What is the potential difference generated by the cell?
Cell emf = 0.23 - - 1.28 = 1.51V
b) In which direction do the electrons flow?
From electrode "D" to "A"
c) What happens to the mass of each electrode ?
Electrode "D" decreases while "A" increases.
d) Which of the two electrodes is the anode and which is the cathode?
Oxidation always occurs at the anode so electrode "D" is the anode (-) and "A" is the cathode(+)
e) What charged particles flow into each half cell?
Positive ions flow into the half cell on the right to overcome the negative charge building up. Negative ions flow into the cell on the left.
f) Give the overall redox reaction

 
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Balance for charge by adding electrons tot he most positive side. Balance for hydrogen by adding Hydrogen ions to the hydrogen deficient side. Balance for oxygen by adding water to the oxygen deficient side. Balance for Ag atoms Balance for oxygen by adding water to the oxygen deficient side. Balance for hydrogen by adding Hydrogen ions to the hydrogen deficient side. Balance for charge by adding electrons tot he most positive side. Home
Each oxygen atom has an oxidation number of -2 Each oxygen atom has an oxidation number of -2 Each potassium atom has an oxidation number of =1