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Topic: Self reduction of least electropositive metals  (Read 2435 times)

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Offline AdiDex

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Self reduction of least electropositive metals
« on: February 16, 2018, 10:46:51 AM »
In most of the place, it is given that less electropositive metal sulfides can be self-reduced eg. Cu, Pb, Hg etc. But I didn't find out any reason why least electropositive metals like Ag and Au can't be self-reduced?
Why Ag2S or Au2S can't be self-reduced?

I am not able to find out any single source which suggests that Au or Ag can be extracted via auto reduction method. Even the Reduction potential of Ag+ is +0.7996 V and Reduction potential of Cu2+ is +0.337 V.

P.S. I found out only this paper, otherwise, there is no mention in the literature.
« Last Edit: February 16, 2018, 11:28:53 AM by AdiDex »

Offline chenbeier

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Re: Self reduction of least electropositive metals
« Reply #1 on: February 16, 2018, 11:33:02 AM »
These sulfide are almost insoluble, so there is no way to get free ions which can be reduced. You can burn (roast) it to get the oxide and dissolved in acid.

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