Preparation of copper oxide
13 g of copper (turnings or wire) are placed in a 600 ml beaker containing 88 ml of 6N nitric acid. The copper slowly reacts with nitric acid and the mixture may be heated toward the end of the reaction if necessary. When all the copper has dissolved 200 ml of water is added and the solution is filtered. 30 g of anhydrous sodium carbonate are dissolved in 300ml of water. The solution is filtered and 250 ml of this solution is poured into the copper nitrate solution. The mixture is stirred and heated to boiling. The solid should turn nearly black. If this does not happen small portions of the sodium carbonate solution is added until it does. The reaction solution is stirred and boiled for additional 3 minutes. Then the solution is allowed to settle in the dish and most of the liquid is removed by decantation. The solid is washed in the portion with 2 liters of distilled water in order to remove soluble salts. The solid is poured onto a filter and allowed to drain as completely as possible. Dry black basic copper carbonate is placed in porcelain evaporating dish and heated with a small flame with stirring. The decomposition takes place at low temperature and the completion of decomposition could be tested by placing a small amount of copper oxide in the test tube with diluted hydrochloric acid. If bubbles of escaping gas are not observed the copper oxide is transferred to a stoppered bottle. If bubbles of escaping gas are observed the decomposition by heat should be repeated.
Synthetic inorganic chemistry, by A. A. Blanchard, 137-139, 1936
copper dioxide (CuO2), copper oxide (CuO), cupric oxide
CUPRIC OXIDE, Copper(II) oxide, oxocopper, Copper monoxide, Copper oxide (CuO), Banacobru ol, Chrome Brown, Copper Brown, Copper monooxide, Black copper oxide, Copper(2+) oxide, Paramelaconite, Copacaps, Copporal, Natural tenorite, C.I. Pigment Black 15, 1317-38-0, Wolmanac concentrate, Boliden Salt K-33, Caswell No. 265, CI Pigment black 15, Boliden-CCA Wood Preservative, CCA Type C Wood Preservative, HSDB 266, Osmose K-33 Wood Preservative, Osmose P-50 Wood Preservative, C.I. 77403, Cu-O Linkage, Osmose K-33-A Wood Preservative, Osmose K-33-C Wood Preservative, EINECS 215-269-1, NSC 83537, EPA Pesticide Chemical Code 042401, CI 77403, Farboil Super Tropical Anti-Fouling 1260, C1O, Copper oxide, CuO, CUPRIC OXIDE, ACS, AC1L24MU, Copper(II) oxide on alumina, 203130_ALDRICH, 450804_ALDRICH, 450812_ALDRICH, 544868_ALDRICH, 61200_FLUKA, 94737_FLUKA, MolPort-001-790-654, 61200_SIAL, 94737_SIAL, 208841_SIAL, 241741_SIAL, 310433_SIAL, 417971_SIAL, NSC83537, NSC-83537, AKOS015950660, AN-49050, LS-54910, AB1002918, FT-0624050, 3B4-1530, 185461-92-1
Copper oxide, copper dioxide (CuO2), UNII-V1XJQ704R4, CID14829, C030973, CuO