|Jan22-13, 01:21 PM||#1|
Potato battery, how does it work?
Hi just made a potato battery, using a cupper coin and zink nails (not connected in any way, just pit in a nail and 3 inches appart a penny), I was just wondering what is the chemistry/physics theory here?
Potatoes contain phosphoric acid
Is it the acid in potatoes that oxidize the 2 metals? or id it the standard electrode potential?
Electrode potential for Zn
Zn(+2) + 2e ---> Zn(s) = -0,76 V (so it want's to be oxidized and should reduce Cu (+2) to Cu (s) because Cupper has a positive electrode potential.
But does the acid oxidize both metals in the first place?
|Jan22-13, 02:25 PM||#2|
Hmmm... can a potato battery produce enough "juice" to light up a pickle?
|Jan27-13, 02:35 PM||#3|
Using a potato is just one of infinity of choices. Any electrolyte should work given it does not pasivate the surface of the metals.
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