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Answer:
Dr. Tetsu Kumagai, who is studying analytical/environmental chemistry, kindly answered the question above.
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Potassium permanganate titration
From redox titration laboratory, with permission
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The reason for refrigeration
Refrigeration is used to prevent the degradation of potassium permanganate by light.
The reason why the experiment was performed at 60
◦C
The reaction does not proceed if the temperature is low. A temperature greater than 60
◦C is necessary for this experiment. The oxidative reaction by potassium permanganate in sulfuric acid is sometimes performed even at 100
◦C. |
The typical example is the measurement of Chemical Oxygen Demand (COD). In this measurement, organic compounds and potassium permanganate are subject to reaction for 30 minutes in a boiling water bath.
The reaction why sulfuric acid is used in this experiment
If hydrochloric acid is used, Cl- is oxidized by potassium permanganate. Since nitric acid itself is oxidizing agent, its use is also inappropriate.
Acknowledgement
Dr. Tetsu Kumagai
He is studying environmental analysis. Please look at his website for details.
*This article is translated by Chemistryquestion.com from the original article in
Chemistryquestion.jp. Please let us know if you find any errors.
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