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8 Aug 2009, 10:00 PM
| #1 (permalink) |
| Junior Member  HSC: 2009 Gender: Male
Join Date: Feb 2008
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17 Mar 2010, 12:23 AM  | Strange result for practical You can hide this advertisement by registering. I have an experiment where magnesium is wrapped around a nail and placed in a petri dish filled with agar/saltwater and indicators to locate anode and cathode. The nail does not corrode beacuse its oxidation reaction has been stifled. Only query is: a white substance has formed around the magnesium on the nail. Magnesium oxide possibly? anyways, what is it, and why is it there? how is this combatted in industrial Mg anodes? |
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29 Aug 2009, 9:24 PM
| #3 (permalink) |
| cbff...  HSC: 2009 Gender: Male
Join Date: Sep 2008
Posts: 593
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17 Mar 2010, 8:44 PM | Re: Strange result for practical Yep. I think itd be magnesium Hydroxide. My guess is that the experiment has been set up for some time? Magnesium is a pretty reactive metal as you know. Although, it is also a self-passivating metal, thus the outer oxide layer neutralises its reactivity. But it seems as though somehow, the agar/saltwater has disintegrated its outer oxide layer, so it readily reacts with hydroxide ions in water.
__________________ 2009 NSW ATAR: 99.50 Bachelor of Pharmacy - Usyd |
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