State briefly all precautions that you have to consider when potassium manganate(VII) is used for a redox titration.
2)why further sulphuric acid has to be added to the cnical flask before titation?
Standardization of potassium manganate(VII) exp question
2007-10-23 5:56 am
回答 (2)
2007-10-27 4:08 pm
✔ 最佳答案
Potassium permanganate KMnO4In the presence of light, KMnO4 solution decomposes to give MnO2(s) and oxygen.
2 KMnO4(aq) → K2MnO4(aq) + 2MnO2(aq) + O2
Sulphuric acid has to be added to acidify potassium permanganate, in order speed up reaction and not to form MnO2, but the acid chosen must not react with potassium permanganate, so sulphuric acid is chosen.
參考: Myself
收錄日期: 2021-04-13 14:06:17
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