To avoid pure trial and error, I need some examples of experiments already done with (possibly ammoniacal) aqueous solutions, particles/precipitates of copper(both oxidation states) salts, and acetylene gas. Since sensitively dependent reactions are often misreported, be sure to provide enough ex...

Is it possible to synthesise such a salt as chromium (III) chromate/dichromate? The intended formulas are $\ce{Cr2(CrO4)3}$ and $\ce{Cr2(Cr2O7)3}$ and they feature both trivalent and hexavalent chromium. However, heating a mixture of chromium (III) oxide and chromium (VI) oxide seems to just prod...