更新1:
Why don`t use methyl orange or litmus indicator?
Chem Titration Question (I)
2008-09-21 1:06 am
Why is phenolphthalein a suitable indicator for titrated sodium hydroxide(NaOH) with ethanedioic acid-2 water ?
回答 (1)
2008-09-21 5:14 am
✔ 最佳答案
Because the titration involved strong base(NaOH) and weak acid (COOH)2. It means when reach the end point, the pH value is above 7. Phenolphthalein will have colour change at pH value of 8. So, it is suitable for detecting the end point in this case.
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