论文部分内容阅读
一、锌与硫酸铜反应的演示实验锌的金属活动性较强,它与硫酸铜溶液反应,置换析出金属铜的速度较快,使锌片表面附着的金属铜晶粒粗糙,显示黑色,而不是红色。若在硫酸铜溶液中滴加氨水,至生成的氢氧化铜沉淀刚好溶解,制成深蓝色的硫酸铜的氨溶液(使溶液中铜离了的浓度减小,大部分的铜离子变成铜氨络离子[Cu (NH_ 3)_4]~(2+))。这时再在溶液中插入锌片(可用废干电池锌皮),由于控制了反应速度,就可以在锌
First, zinc and copper sulfate reaction experiments Zinc metal activity is strong, it reacts with the copper sulfate solution, the replacement of metal copper faster, so that the surface of the zinc sheet attached to the metal copper rough grain, showing black, and Not red. If ammonia solution is added dropwise to the solution of copper sulfate, the resulting precipitate of copper hydroxide just dissolves to make a dark blue solution of copper sulfate in ammonia solution (the concentration of copper in the solution is reduced and most of the copper ions become copper Ammonium ion [Cu (NH_3) _4] ~ (2+)). Then insert the zinc solution in the solution (available waste battery zinc skin), due to the control of the reaction rate, you can zinc