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后加热CuO,反应完毕后先撤酒精灯,冷却后再停止通H2。 14.配制物质的量浓度溶液时,先用烧杯加蒸馏水至容量瓶刻度线1cm~2cm后,再改用胶头滴管加水至刻度线。 15.安装发生装置时,遵循的原则是:自下而上,先左后右或先下后上,先左后右。 16.浓H2SO4不慎洒 ...
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