Copper Oxide - Sankado

[ I ] Copper(I) oxide: Cu ₂ O (143.09). Also known as cuprous oxide. Found naturally as cuprite. Yellow copper(I) oxide is obtained by carefully treating an alkaline aqueous solution of copper(II) salt with a reducing agent such as hydrazine. Red copper(I) oxide is obtained by thermal decomposition of copper(II) oxide. Depending on the manufacturing process, yellow, orange, red, or dark brown copper(I) oxide can be obtained, but the color change is due to differences in the size of the crystal particles. Melting point: 1232°C. Decomposes above 1800°C. Density: 5.88 g cm ^-3 . Insoluble in water. Dissolves in dilute sulfuric acid to produce copper(II) sulfate and copper. When ammonia water and concentrated hydrohalic acid (HX) are added, it dissolves to form colorless complex salts such as [Cu(NH ₃ ) ₂ ]OH and H[CuX ₂ ]. When the hydrohalic acid is dilute, it turns into the corresponding halogen salt CuX _2. Soluble in aqueous alkali hydroxide solutions. Used in rectifiers, red glazes, disinfectants, ship bottom paints, etc. [CAS 1317-39-1] [ II ] Copper(II) oxide: CuO(79.55). Found naturally as chalcopyrite. Obtained by heating and oxidizing copper powder in excess oxygen, or by thermal decomposition of copper(II) nitrate or copper(II) carbonate. Amorphous black powder. Amorphous copper oxide has the ability to adsorb large amounts of gas. Density 6.3-6.4 g cm ^-3 . Insoluble in water. Dissociates into copper(I) oxide and oxygen at temperatures above 1000 °C. Reduced by hydrogen at 250 °C. A strong oxidizing agent used in organic elemental analysis and gas analysis. It is also used in catalysts, pigments, ceramic glazes, glass colorants, and materials for electronic components. [CAS 1317-38-0]

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

【Ⅰ】酸化銅(Ⅰ)：Cu₂O(143.09)．亜酸化銅ともいう．天然には赤銅鉱として産出する．銅(Ⅱ)塩のアルカリ性水溶液を，ヒドラジンなどの還元剤で注意深く処理すると黄色の酸化銅(Ⅰ)が得られる．酸化銅(Ⅱ)を熱分解すると赤色の酸化銅(Ⅰ)が得られる．製法により，黄，橙，赤，暗褐色の酸化銅(Ⅰ)が得られるが，色の変化は結晶粒子の大きさの差による．融点1232 ℃．1800 ℃ 以上で分解する．密度5.88 g cm^－3．水に不溶．希硫酸に溶けて硫酸銅(Ⅱ)と銅を生じる．アンモニア水および濃厚なハロゲン化水素酸HXを加えると[Cu(NH₃)₂]OHおよびH[CuX₂]などの無色の錯塩をつくって溶ける．ハロゲン化水素酸が希薄なときは相当するハロゲン塩CuX₂にかわる．水酸化アルカリ水溶液に可溶．整流器，赤色うわぐすり，殺菌剤，船底塗料などに用いられる．[CAS 1317-39-1]【Ⅱ】酸化銅(Ⅱ)：CuO(79.55)．天然には黒銅鉱として産出する．銅粉を過剰な酸素中で加熱酸化するか，硝酸銅(Ⅱ)または炭酸銅(Ⅱ)の熱分解で得られる．黒色の無定形粉末．無定形な酸化銅は多量の気体を吸着する性質がある．密度6.3～6.4 g cm^－3．水に不溶．1000 ℃ 以上で酸化銅(Ⅰ)と酸素に解離する．250 ℃ で水素により還元される．強力な酸化剤で有機元素分析，ガス分析に用いられる．そのほか，触媒，顔料，窯業用うわぐすり，ガラス用着色剤，電子部品用材料などに用いられる．[CAS 1317-38-0]

出典　森北出版「化学辞典（第2版）」化学辞典 第2版について　情報