『It can turn wet pH paper red and then white.』
點解 and then white????
Chlorine gas~
2006-11-16 10:53 pm
回答 (4)
2006-11-16 11:00 pm
✔ 最佳答案
因為chlorine 會有bleaching, 漂白既功能。一開始的變色是因為酸鹼值的改變，變白色就是因為漂白了～
2006-11-17 5:46 am
because when chlorine gas dissolve in the water
on the pH paper . hydrocholric acid and hypochlorous acid(HOCl) will be formed.
hypochlorous acid contain OCl- ion. OCl- has bleaching properties.
so it bleaches the paper and then it turns white.
on the pH paper . hydrocholric acid and hypochlorous acid(HOCl) will be formed.
hypochlorous acid contain OCl- ion. OCl- has bleaching properties.
so it bleaches the paper and then it turns white.
2006-11-17 2:40 am
因為氯氣溶於水:Cl2 +H2O <=> CL- + OCL - + 2H+
當中的H+(氫離子)，令pH paper變red。
而OCL-具漂白能力(是漂白水的有效成份，so pH paper turn white.
當中的H+(氫離子)，令pH paper變red。
而OCL-具漂白能力(是漂白水的有效成份，so pH paper turn white.
2006-11-16 11:06 pm
變紅係因為佢屬酸性，之後再變白係因為Chlorine有漂白功能將佢漂白左﹏
收錄日期: 2021-04-12 18:05:55
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