Fe2+、Fe3+的检验及转化

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Fe,2+,、,Fe,3+,的检验及转化,思考,P74,交流与讨论,一、,Fe,2+,、,Fe,3+,与碱作用,实验一：分别向,FeCl,2,、,FeCl,3,溶液中加入,NaOH,溶液，,振荡并观察现象,实验,现象,方程式,Fe,2+,与碱作,用,Fe,3+,与碱作用,白色沉淀迅速变成,灰绿色，最后变成红褐色,Fe,2+,+2OH,-,=Fe(OH),2,4Fe(OH),2,+O,2,+2H,2,O=4Fe(OH),3,红褐色沉淀,Fe,3+,+3OH,-,=Fe(OH),3,二、,Fe,2+,、,Fe,3+,与,KSCN,溶液作用,实验二：分别向,Fe,2+,、,Fe,3+,溶液中滴入几滴,KSCN,溶液，,振荡观察现象,实验,现象,方程式,Fe,2+,与,KSCN,溶液作用,Fe,3+,与,KSCN,溶液作用,无明显变化,溶液显红色,Fe,3+,+3SCN,-,=Fe(SCN),3,Fe,2+,、,Fe,3+,的检验及转化,问题,1,：通过,KSCN,溶液来检验,Fe,3+,的方法，能否,设计,Fe,2+,检验的其他方法？,实验小结：检验,Fe,2+,、,Fe,3+,的方法,1,、用,NaOH,溶液，通过沉淀颜色来检验,2,、用,KSCN,溶液来检验,Fe,3+,（反应灵敏，是常用方法）,四、理论分析及应用,实验四：根据说明书，某液体补铁产品中含,Fe,2+,，请用实验检验,：,铁元素是否变质？,若没变质，请继续检验,产,品中是否真的含有,Fe,2+,.,实验方案：,向试管中加,入口服液,滴入,KSCN,溶液,若显红色说明有,Fe,3+,，已变质,无明显变化,滴入双氧水,显红色，没变质、含,Fe,2+,若无明显变化，不含,Fe,2+,Fe,2+,、,Fe,3+,的检验及转化,1,、已知甲、乙两烧杯中分别是,Fe,2+,、,Fe,3+,的溶液，如何区别？,（,1,）观察颜色,溶液为浅绿色的是,Fe,2+,溶液，显黄色的是,Fe,3+,的溶液,（,2,）分别加入,NaOH,溶液,产生白色沉淀的是,Fe,2+,溶液，产生红褐色沉淀的是,Fe,3+,的溶液,（,3,）分别滴入,KSCN,溶液,无明显变化的是,Fe,2+,溶液，显红色的是,Fe,3+,的溶液,课堂练习,Fe,2+,、,Fe,3+,的检验及转化,作业：,1,、请同学们下去思考实验室中应该如何保存,Fe,2+,溶液？,2,、请同学们查找资料了解缺铁性贫血有哪些症状？,Fe,2+,、,Fe,3+,的检验及转化,