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《江苏教育》(中学版)1989年第2期上,刊登了刘斌老师的题为“为什么要用新制 Cu(OH)_2?”的文章,文中从 Cu(OH)_2絮状物结构表面的疏松和紧密,活性表面的多少,以及久置 Cu(OH)_2易分解的角度,解释了为什么在乙醛氧化实验中要用新制Cu(OH)_2的原因,读起来似乎很有道理。但笔者通过有关实验发现,“氢氧化铜”不一定要新制的,关键是溶液的碱性要强。〔实验1〕取2%CuSO_4溶液2ml,然后逐滴加10%的 NaOH 溶液,并在不同 pH 值时加0.5ml 乙
“Jiangsu Education” (Secondary Edition), Issue 2, 1989, published an article by Liu Bin entitled “Why Use New Cu(OH)_2?”, from the surface of the Cu(OH)2 floc structure. The loose and tight, active surface, and long-standing Cu(OH)2 decomposable angles explain why the use of the new Cu(OH)2 in the acetaldehyde oxidation experiment seems to make sense. However, the author found through experiments that “copper hydroxide” does not have to be new, and the key is that the alkaline solution is stronger. [Experiment 1] Take 2ml of 2% CuSO 4 solution, then add 10% NaOH solution dropwise, and add 0.5ml of B at different pH values.