Naked Science Forum

Non Life Sciences => Chemistry => Topic started by: taregg on 20/10/2011 10:56:36

Title: which one is the stronger element does not oxidize gold or platinum?
Post by: taregg on 20/10/2011 10:56:36

the same question....

Title: which one is the stronger element does not oxidize gold or platinum?
Post by: taregg on 23/10/2011 07:17:22

please some body ask my question....

Title: which one is the stronger element does not oxidize gold or platinum?
Post by: Bored chemist on 23/10/2011 11:06:44

I think there's a language problem here.
Are you asking if gold or platinum is harder to oxidise?

Title: which one is the stronger element does not oxidize gold or platinum?
Post by: taregg on 23/10/2011 18:56:15

so which one harder for oxidise gold or  platinum ..... I mean

Title: which one is the stronger element does not oxidize gold or platinum?
Post by: Bored chemist on 23/10/2011 19:03:09

Gold, according top this
http://en.wikipedia.org/wiki/Table_of_standard_electrode_potentials

Title: which one is the stronger element does not oxidize gold or platinum?
Post by: damocles on 25/10/2011 04:33:28

Standard Electrode Potentials are about equilibrium situations; they are not concerned with rates of reaction. In a thermodynamic sense platinum is easier to oxidize than gold, but with most reagents this does not apply in a kinetic sense.

Problem is that if you can get gold to react, it will react fairly rapidly, whereas the oxidation reactions of platinum tend to be very slow. You can put a lump of gold in concentrated aqua regia (3:1 HCl:HNO₃ at about 10 M total in water) at room temperature and watch it dissolve before your eyes. Platinum you have to reflux for a couple of days. (yes, I have actually tried and witnessed the results of both experiments).

Similarly gold tarnishes quite readily in an atmosphere of damp chlorine gas; platinum much more slowly. (This is only from reports; I have not witnessed it).

Title: which one is the stronger element does not oxidize gold or platinum?
Post by: lightarrow on 25/10/2011 13:21:28

And which one oxides more easily with sulfur?  [:)]