New answers tagged electrolysis
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If you plate the pieces with zinc or silver, the main source of zinc/silver in the ground coffee will be from abrasion between the parts and the coffee beans and not from chemical attack.
A few milligrams of zinc or silver (or iron for that matter) won't to do any harm to your health, specially if diluted in many coffee cups along several months or years.
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Technically you are correct. The thermodynamic potential of electrolyte decomposition should not be affected by the electrode composition.
which just influences kinetics, not thermodynamics.
The word "just" here is doing way more work than you're giving it credit for. There are situation where the kinetics of electrolyte decomposition are so slow that ...
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The primary problem is too low permeability = too high resistence of the gloves, causing high voltage drop where it should be minimal one.
The gloves are not hydrophilic enough for electrolyte soaking to get low resistance.
The remaining voltage - after subtracting the glove voltage drop - is not high enough to cause electrolysis by significant current.
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I have also seen a white precipitate in a galvanic cell scenario involving aluminum and magnesium sulfate.
My guess is $\ce{Mg[Al(OH)4]2}$ and not $\ce{Mg(OH)2}$ which can form a problematic white suspension (not observed).
An extract from Wikipedia:
There are many mixed oxides containing aluminium where there are no discrete or polymeric aluminate ions....
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Magnesium sulfate ionizes to Mg++ and SO4-- ions in water. When current is passed thru a solution of these ions, sulfate ion will be electrolyzed at the anode, giving O2 and SO3 which becomes H2SO4. The pH at the anode will decrease as acid is produced and attacks the aluminum. A thick layer may build up. This is the basis for anodization of aluminum https://...
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Aluminum is not a good idea for carrying out electrolysis, because this metal is covered by a thin layer of aluminum oxide (or alumina) that is insulating. The current passing between these electrodes must be really weak, because the resistance of this layer is high. So that you need a high tension to break this layer and make an electrolysis. But, as soon ...
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Actually, you have some time to collect Na. It will float and if you add oil on tge top of the water, Na will collect there. Then you just have to collect the very small pieces and press it togeather into a bigger piece, which you then store in parafine or something simillar.
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