Answer Happy

Write the reduction half equation and oxidation half equation for the reaction between copper and zinc. What is the full equation? (2 marks)
Define the term “Salt bridge.” What is a suitable salt bridge for this galvanic cell? (2 marks)
State the equation that are used to calculate ∆rG, ∆rS, ∆rH for electrochemical cells. (3 marks)
Results
Table below shows the electrode potential for Cu/Zn electrochemical cell at various temperatures and concentrations.
Concentration of Cu/Zn electrolyte (M)
Electrode potential (V)
65℃
55℃
45℃
35℃
30℃
1.0
1.096
1.099
1.072
1.080
1.085
0.10
1.078
1.075
0.991
1.092
1.069
0.010
1.060
1.072
0.984
1.070
1.031
0.0010
1.021
1.031
0.931
0.999
1.063
0.00010
1.010
0.016
0.906
0.973
0.972
Data Treatment
Write the cell diagram for each electrochemical cell at the various concentration. (5 marks)
Plot a graph of electrode potential against temperature (℃) for each electrochemical cell. Determine the temperature coefficient dEdTfor each electrochemical. (15 marks)
Show a sample calculations used to obtain a value for each of the temperature coefficient dEdT at 302 K for each electrochemical cell. (5 marks)
Show a sample calculation used to obtain ∆rG, ∆rS, ∆rH for each electrochemical cell at 302K and 1.0M ( 5 marks)