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一、分子式测定的实验1.氧化铜分子式的测定——称量法用一硬质玻璃管,管的末端开一个孔(如图〈1〉所示),称其重量。在管内放入少量的氧化铜(如图〈1〉所示),再称其重量。如图〈1〉所示装置好仪器,然后将气体通入仪器(在管内尚未完全充满气体之前切勿点燃喷口)。加热管子并燃烧过剩的气体,氧化铜被还原(象水一样氧气被移去)。当所有的氧化铜被还原成铜时(这时黑色粉末转变成棕色),停止加热但继续通入气体,直到管子冷却为止,否则,进入管内的空气将再氧化单质铜。切断气体供应,并再称其重量。
First, the experimental determination of molecular formula 1. Determination of copper oxide molecular formula - Weighing method with a hard glass tube, the end of the tube to open a hole (as shown in Figure <1>), said its weight. Put a small amount of copper oxide in the tube (as shown in <1>) and weigh it. Assemble the instrument as shown in <1>, and then pass the gas into the instrument (do not ignite the nozzle before the tube is completely filled with gas). Heating the pipe and burning excess gas, copper oxide is reduced (oxygen is removed like water). When all of the copper oxide is reduced to copper (in which case the black powder turns brown), the heating is stopped but the gas continues to flow until the tube cools. Otherwise, the air entering the tube will reoxidize the elemental copper. Cut off the gas supply and weigh it again.