Materials Found: Voltmeter actually using Logger Pro with laptop Various metals
ID: 503924 • Letter: M
Question
Materials Found: Voltmeter actually using Logger Pro with laptop Various metals looks lke A, Ni. Cu, Fe and Zn Electrochemical cell setup Sandpaper Preliminary Calculations: Using your textbook (refer to Chapter 18 sec. 1-6) and based on the identified metals, write reduction half. reactions with their corresponding potentials. Reduction Potential Reduction Half-Reaction Put the above metals in order of the decreasing reduction potential in the following table. Reduction Half Reaction Reduction Potential (V) At this point you have enough information to rank the metals from the lowest to the highest tendency to be the pole or anode (site of oxidation) The more negative the reduction potential the more likely the metal prefers to be oxidized. The more positive the reduction potential the more likely the metal prefers to be reduced. Revision 3/17 CHM1221 (University Chemistry l) Lab Manual Page 3Explanation / Answer
Solution:
The metal Al, Ni, Cu, Fe and Zn & its half-cell reaction scheme with electrochemical details are expressed below,
Metal Reduction reaction Reduction Potential (V)
Al Al3+ + 3e- = Al(s) -1.66
Ni Ni2+ + 2e- = Ni(s) -0.25
Cu Cu2+ +e- = Cu+ 0.16
Cu+ + e- = Cu(s) 0.52
Fe Fe3+ + e- = Fe2+ 0.77
Fe2+ + 2e- = Fe(s) -0.44
Zn Zn2+ + 2e- = Zn(s) -0.76
The decreasing order of the above tabulation is as follows,
Metal Reduction reaction Reduction Potential (V)
Al Al3+ + 3e- = Al(s) -1.66
Zn Zn2+ + 2e- = Zn(s) -0.76
Fe Fe2+ + 2e- = Fe(s) -0.44
Ni Ni2+ + 2e- = Ni(s) -0.25
Cu Cu2+ +e- = Cu+ 0.16
Cu+ + e- = Cu(s) 0.52
Fe Fe3+ + e- = Fe2+ 0.77