ce chem end point問題!!

2008-03-27 8:36 am

weak acid (係burette入面)加strong alkaline(係conical flask入面)
用phenolphthalein做titration

咁colour change係咩???

如果strong acid(係burette入面)加strong alkaline(係concial flask入面)
都係用phenolphthalein做titration

咁colour change又係咩????

會考咁答都o岩??????

請各位chem高手幫忙解答!!!!!!
plz!!!!!!!

更新1:

我本chem書phenolphthalein係alkaline時,係red 咁你話phenolphthalein係alkaline時,係purple 兩樣會考都接受??

回答 (1)

用戶7369

2008-03-27 6:34 pm

✔ 最佳答案

at the beginning, it is purple in colour.
when the weak or strong acid is added to the alkaline
solution, the solution is still purple. until the end point is reached'
the solution is pale pink. excess acid will make the solution
colourless.

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