Preparation of copper(I) oxide
In a 2-liter Erlenmeyer flask a solution of 55 g of copper sulfate 5-hydrate is mixed with one of 25 g of hydroxylammonium chloride in 125 ml water. While cooling the mixture in a cold water bath and swirling well, a solution of 40 g of sodium hydroxide in 750 ml water is added. The precipitate is allowed to settle and the supernatant liquid is poured off. The copper(I) oxide is transferred with a little water to a smaller vessel and washed by repeated decantation until the rinsings are chloride-free, then suction filtered and the residue washed with 95% alcohol and with ether. The product is dried in warm air. The yield of copper(I) oxide is 13.5-15.5 g.
Inorganic laboratory preparations, by G. G. Schlessinger, 10, 1962
75 g of potassium sodium tartrate (Rochelle salts) are mixed with 75 g of sodium hydroxide in 600 ml of warm water and 50 g of copper sulfate 5-hydrate are dissolved in the liquid to give a deep blue solution (Fehling’s) of the copper tartrate complex. A solution of 7-8 g of hydrazine sulfate in 100 ml of hot water is added slowly with stirring, and the entire reaction mixture is heated to the boiling point with continuous agitation. Heating is maintained for about 10 minutes; the blue color should have completely disappeared and given way to a brick-red precipitate of product. The material is allowed to settle and the supernatant liquid is decanted. The residue of cuprous oxide is washed repeatedly by decantation with water until free of sulfates, then suction filtered, the residue washed with 95% alcohol and with ether. The product is dried in warm air. The yield of copper(I) oxide is 14 g.
Inorganic laboratory preparations, by G. G. Schlessinger, 10-11, 1962
50 g of copper sulfate 5-hydrate and 100g of sodium chloride are dissolved in 600 ml of boiling water. 120 g of sodium sulfite 7-hydrate (or 60 g of the anhydrous salt) are added with stirring; a colorless liquid is finally produced after the initial formation of a greenish precipitate. The reaction mixture is cooled somewhat and is poured slowly into a solution of 40 g of sodium hydroxide in 200 ml of water. A yellow precipitate is formed immediately which slowly turns reddish after thirty minutes of boiling with frequent stirring. TThe residue of cuprous oxide is washed repeatedly by decantation with water until free of sulfates, then suction filtered, the residue washed with 95% alcohol and with ether. The product is dried in warm air.
Inorganic laboratory preparations, by G. G. Schlessinger, 11, 1962
CUPROUS OXIDE, Copper(I) oxide, Perenox, Dicopper oxide, Red copper oxide, Copper oxide (Cu2O), Cupramar, Cuprocide, Fungimar, Kuprite, Oleocuivre, Perecot, Nordox, Copox, Copper suboxide, Copper sardez, Copper Sandoz, Yellow Cuprocide, Dicopper monoxide, Brown copper oxide, Copper(1+) oxide, Caocobre, Perenex, Copper nordox, Copper-sandoz, Oxyde cuivreux, Yellow compound, Oleo nordox, Copper hemioxide, Copper protoxide, Cobre [Sandoz], Copper oxide, red, Cu-O-Cu Linkage, Purple Copp 92, Purple Copp 97, Purple Copp 97N, Fungi-rhap Cu-75, Red Copp 92, Red Copp 97, Red Copp 97N, Caswell No. 266, Kupferoxydul [German], Cuprous oxide [ISO], Cupper oxide [Russian], Cuprous Oxide Type Two, Oxyde cuivreux [French], Cuprous Oxide, AA Grade, Copper oxide (8CI,9CI), Oxyde cuivreux [ISO-French], CCRIS 2289, CP Cuprous Oxide Pigment Grade, C.I. 77402, HSDB 1549, EINECS 215-270-7, NSC 83538, CI 77402, C2O, Kupferoxydul, Cupper oxide, Copper(1) oxide, NCIOpen2_001242, WLN: CU2 O, 12841_RIEDEL, 208825_ALDRICH, 566284_ALDRICH, 678945_ALDRICH, 61205_FLUKA, MolPort-001-789-014, 12841_SIAL, 208825_SIAL, 566284_SIAL, NSC83538, NSC-83538, AKOS015903626, IN009606, LS-54911, I14-18096, 633343-78-9
cobre, Cuprite, Copper oxide, Copper (I) oxide, UNII-T8BEA5064F, CID14830, 1317-39-1, C000520