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(一)用硝酸铜制氧化铜:在洁净的试管里加入少量(约一粒米大)的硝酸铜晶体,滴入几滴水,加热并旋转试管,使管壁内形成一层均匀的氧化铜薄层,加热使管内的二氧化氮和水分除尽后,加入干燥的木炭粉。按课本上的装置进行加热,几分钟后,试管壁上就有一层紫红色(或亮红色)的物质形成。澄清石灰水也变浑浊,(试管事先洗刷很干净的话,可形成铜镜),为了证明紫红色物质是铜,待试管内物质冷却后,倒去剩余的木炭粉,用水冲洗木炭粉,再加入稀硫酸或稀盐酸,加热之,管壁上的紫红色物
(a) Use copper nitrate to make copper oxide: Add a small amount (a grain of rice) of copper nitrate crystals to a clean test tube. Add a few drops of water. Heat and rotate the tube to form a uniform layer of copper oxide in the wall of the tube. The thin layer is heated and the nitrogen dioxide and moisture in the tube are removed and the dried charcoal powder is added. After heating for a few minutes, a purple-red (or bright red) material forms on the wall of the tube. Clear lime water also becomes turbid (if the test tube is cleaned first, it can be formed into a copper mirror). To prove that the purple-red material is copper, after the in-tube material is cooled, pour the remaining charcoal powder, rinse the charcoal powder with water, and add it. Dilute sulfuric acid or dilute hydrochloric acid, heated, magenta on the wall