1. Electrolysis of Coppe
Positive Post (Anode) Negative Post (Cathode)
Mass of Ce Electrode
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“ime of Eletrolysi
(minutes) 15 ming | 15 mins
Mass of Copper Electrode gegzar XXXXXXXXXXgett Gaz g
After Electrolysis
Mass change of Coppe
| Electrode (=)o XXXXXXXXXXFay
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Charge transfe
ed during
Electrolysis
Total Cu
ent passed
through each electrode
% Difference in cu
ent
values
2. Qualitative evaluation of spontaneous and non-spontancous reactions
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fin Zn(NO3)2 soln
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3. Voltaic cell potentials (raw data, XXXXXXXXXX)
Positive Terminal (+) Negative Terminal (-) Voltage (must be positive)
Copp Eine 0-61)
Copper Lead 0-353
Copper Tron 0-aal
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Name
Group
Results
1. Electrolysis of Coppe
Positive Post (Anode)
Negative Post (Cathode)
Mass of Copper Electrode
Before Electrolysis
Time of Electrolysis
(minutes)
Mass of Copper Electrode
After Electrolysis
Mass change of Copper
Electrode
moles of Coppe
consumed/generated
Charge transfe
ed during
Electrolysis
Total Cu
ent passed
through each electrode
% Difference in cu
ent
values
2. Qualitative evaluation of electrolytic and voltaic cells.
Electrode
Observations
Zn metal
in CuSO4 solution
Zn metal/Graphite
9V Battery
(CuSO4 solution)
Cu metal
in Zn(NO3)2 solution
Cu metal/Graphite
9V Battery
(Zn(NO3)2 solution)
3. Voltaic cell potentials (raw data, XXXXXXXXXX)
Positive Terminal (+)
Negative Terminal (-)
Voltage (must be positive)
Voltaic cell potentials ordered (including Cu/Cu2+; 3.5)
Positive Terminal (+)
Negative Terminal (-)
Voltage (must be positive)
4. Reduction Potentials XXXXXXXXXX)
Metal Reduction Potential
Reduction Potential (Cu reference) (4/7)
Adjusted Reduction Potential (Hydrogen reference – +0.34V)
Reduction Potential from table (Chang p766)
% E
o
Questions
1. Write the overall chemical reaction for each voltaic cell examined (note that there must be both an oxidation and a reduction).
1. What did you observe in the qualitative evaluation of voltaic and electrolytic cells. Identify all cells that were voltaic and all cells that were electrolytic. For one of the electrolytic cells explain how you could prepare a voltaic cell from the same materials.
1. Using standard cell reduction potentials indicate the voltage expected for each of the following cells under standard conditions. Label each cell as voltaic or electrolytic.
a) Cr(s) | Cr3+(aq) || Hg22+(aq) | Hg(l)
a) I-(aq) | I2 (s) || S2O82-(aq) | SO42-(aq) (Where have you seen this reaction before?)
a) Al(s) | Al3+(aq) || F2 (g) | F_(aq)
a) Br-(aq) | Br2 (l) || Cl2 (g) | Cl-(aq)