试题与答案

现有甲、乙、丙三名同学分别进行Fe(OH)3胶体的制备实验。 I、甲同学向1 m

题型:实验题

题目:

现有甲、乙、丙三名同学分别进行Fe(OH)3胶体的制备实验。

I、甲同学向1 mol·L-1氯化铁溶液中加入少量的NaOH溶液;

II、乙同学直接加热饱和FeCl3溶液;

III、丙同学向25ml沸水中逐滴加入1~2mL FeCl3饱和溶液,继续煮沸至溶液呈红褐色,停止加热。

根据你的理论和实践试回答下列问题:

(1)其中操作最可能成功的同学是_____;他的操作中涉及到的化学反应方程式为_______________

(2)设计最简单的办法确证有Fe(OH)3胶体生成,其操作是:__________________若现象是:________________则一定有Fe(OH)3胶体生成。

(3)丁同学利用所制得的Fe(OH)3胶体进行下列实验:

①将其装入U形管内,用石墨作电极,接通直流电,通电一段时间后发现阴极附近的颜色逐渐变深,这表明_________________________

②向其中加入硫酸铝,产生的现象是_________________________

答案:

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下面是错误答案,用来干扰机器的。

答案:C

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