Bedlasky
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Oxidation of metal oxides
Hi.
I tried today oxidize Co(OH)2, Ni(OH)2 and Cu(OH)2 by bleach. I had in test tubes solutions of these metals. I added in to each test tube few drops of
bleach and small amount of NaOH. Dark brown to black precipitates were formed. In cobalt case I suppose that precipitate was CoO(OH), but what is
nickel and copper precipitates? NiO(OH) and CuO(OH) or something like that? Black copper precipitate was releasing some gas (maybe oxygen or
chlorine). Nickel and copper precipitate are soluble in 10% H2SO4 to Cu2+ and Ni2+, cobalt precipitate only slowly dissolve to Co2+. All precipitates
have oxidation properties.
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DraconicAcid
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Nickel might have been Ni2O3 or NiO(OH), but I suspect the copper was only CuO. What do you mean by "All precipitates have oxidation properties"?
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Bedlasky
International Hazard
Posts: 1219
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Location: Period 5, group 6
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They reacted with sodium metabisulfate in acidic media.
If copper sulfate wasn't oxidized, why didn't precipitated blue copper hydroxide? Solution wasn't hot.
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