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Is DI water (also without $\ce{O2}$ gas dissolved in it after degasification) a sufficiently strong oxidizer to oxidize $\ce{Cu(I)}$ in $\ce{Cu2O}$ to $\ce{Cu(II)}$ forming $\ce{CuO}$?

Will this change at elevated temperatures (e.g., 200 °C)?

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    $\begingroup$ Why do you even ask this? $\endgroup$ – Mithoron May 17 '17 at 21:09
  • $\begingroup$ @Mithoron I'm wondering whether it is possible to obtain pure Cu2O films via vacuum deposition techniques that uses water vapor as the co-reactant, or wll it require post-deposition treatments to remove the Cu(II). $\endgroup$ – Nyxynyx May 17 '17 at 22:26
  • $\begingroup$ Then I guess you should add a lot of details to question. If you simply put Cu2O to water then almost nothing happens, but with superheated vapor, I dunno... $\endgroup$ – Mithoron May 17 '17 at 22:47
  • $\begingroup$ Might there be the opposite problem? Water vapor oxidizes copper metal to +1 only with difficulty if at all. There is an old heat treating test for air vs moisture leaks based on the fact that copper is inert to water vapor. airproducts.com/industries/Metals/ask-the-experts-metals/… $\endgroup$ – Oscar Lanzi May 18 '17 at 1:10

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