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,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,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,*,*,含氯消毒剂的性质研究,丰台二中 李艳,1984,年,地坛医院的前身北京第一传染病医院研制出能迅速杀灭各类肝炎病毒的消毒液,主要有效成分为,次氯酸钠,,定名为,“,84,”,肝炎洗消液,后更名为,“,84,消毒液,”,。目前广泛应用于宾馆、医院、食品加工行业、家庭等的卫生消毒。,任务一:,与同组同学讨论,NaClO,有哪些化学性质,并提出一些使用,84,消毒液时的注意事项。,漂白性,水解出的,HClO,易分解,氧化性,试管,1,在短时间内未褪色,一段时间后褪色;,试管,2,迅速褪色;,试管,3,迅速褪色,并出现大量气体,湿润的淀粉碘化钾试纸变蓝。,一滴管,0.0002mol/L H,2,SO,4,一滴管,2mol/L H,2,SO,4,一滴管蒸馏水,思考,:,为什么,84,消毒液不能与酸性物质混用?,ClO,-,HClO,H,+,起漂白作用的微粒为,HClO,Cl,-,Cl,2,H,+,浓度越大,,HClO,浓度越大,氧化性越强(可氧化,Cl,-,),试管,1,约,5min,的变化,84,消毒液,淀粉溶液,KI,溶液,提供试剂,任务二,:,不改变溶液的酸碱性,通过实验验证,84,消毒液是否具有氧化性。如何选择试剂?,实验要求:,1,、节约试剂;,2,、取好第一种试剂后,第二种试剂需逐滴滴加;,3,、记录好试剂滴加的先后顺序和实验现象;,2,2,2,2,2,2,2,2,2,淀粉与碘形成的络合物,因反射蓝光而呈现蓝色,资料卡片,:,实验分析,方案一:,向淀粉,KI,溶液中滴加,84,消毒液,,出现蓝色,。继续滴加,,蓝色消失。,方案二:,向,84,消毒液中滴加淀粉,KI,溶液,,出现少许蓝色,振荡立即消失。,继续滴加,,,出现蓝,色。,解释:,I,2,具有还原性,可以继续,被氧化,如何解释?,思考,:,向新制,FeSO,4,(由过量,H,2,SO,4,与铁粉反应制得)溶液中逐滴滴加,84,消毒液,请预测实验现象。,Cl,2,、,Fe,3+,请书写以上实验过程中涉及到的离子方程式,存在微粒:,SO,4,2-,、,H,+,、,Fe,2+,Cl,-,、,ClO,-,微粒之间的相互作用:,Cl,-,、,ClO,-,?,ClO,-,与,Fe,3+,互促水解,交流与讨论:,通过以上实验你对物质之间的反应有何进一步认识?,溶液的酸碱性,试剂用量,(滴加,顺序),连续的氧化还原,连续发生氧化还原、双水解,.,复杂,体系的多种反应,性质预测,性质预测,类别,化合价,特性,实验验证,得出结论,结合实验,联系用途,研究物质性质的思路:,T,hank You,!,
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