Homework Help: chemistry- DrBob

Posted by Amy on Friday, May 16, 2008 at 8:57pm.

Last week i did a lab and i just wanted to show you my results because my computer was acting weird when i used the voltage probe.(I just needed you to check that the cathode and anodes and voltages make sense)

CuSO4(cathode)and Al2(SO4)3 (anode)--[0.050V]

cuSO4(anode) and ZnSO4(cathode)-- [0.048 V]

MgSO4(anode)and ZnSO4(cathode)--[0.284 V]

ZnSO4(anode) and AlSO4(cathode)-- [-0.056V]

Al2(SO4)3(cathode) and MgSO4(anode)--[0.966 V]

CuSO4(cathode)and ZnSO4(anode)--[-0.484]

chemistry- DrBob - DrBob222, Friday, May 16, 2008 at 11:02pm
I can't check any of the voltages; I assume these were at other than 1 M. For the Al/Cu (#1 below) the voltage would be about 2.0 volts for 1 M solutions of each. Also, it MIGHT be possible, for some that I have suggested as the other way around below, could be correct if the concentrations were not 1 M.

CuSO4(cathode)and Al2(SO4)3 (anode)--[0.050V]
OK.

cuSO4(anode) and ZnSO4(cathode)-- [0.048 V]
I think Zn is the anode and Cu is the cathode.

MgSO4(anode)and ZnSO4(cathode)--[0.284 V]
OK\

ZnSO4(anode) and AlSO4(cathode)-- [-0.056V]
I think Al is the anode and Zn is the cathode.

Al2(SO4)3(cathode) and MgSO4(anode)--[0.966 V]
OK

CuSO4(cathode)and ZnSO4(anode)--[-0.484]
OK
- chemistry- DrBob - amy, Friday, May 16, 2008 at 11:10pm
  They are 0.1 M solutions. I have tons of post lab dicussion questions you think you can help me with them? I don't even know where to start
  - chemistry- DrBob - DrBob222, Saturday, May 17, 2008 at 1:23am
    I suppose what you posted above are some of the tons of discussion questions. I think I answered one of them completely enough that you can follow that for the others.

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