Hello, KMnO4 solutions due to the strong oxidizing nature readily forms MnO2 on contact with any impurities or trace metals in water. Traditionally sources of KMnO4 always contained traces of MnO2 . KMnO4 solutions also light sensitive.
Because it can degrade (change valency) into MnO2 when heated. However, it is commonly used as a standard solution if it can be titrated against a known standard solution like As.
Hello, KMnO4 solutions due to the strong oxidizing nature readily forms MnO2 on contact with any impurities or trace metals in water. Traditionally sources of KMnO4 always contained traces of MnO2 . KMnO4 solutions also light sensitive.
Ashokkumar V. Rajani Light has catalytic effect on this decomposition of KMnO4, so often be stored in brown bottles in the laboratory.
See link below for more info.
Good luck!
https://www.google.com/amp/s/amp.chemicalbook.com/ProductChemicalPropertiesCB7775235_EN.htm
Article The PhotoChemistry of Potassium Permanganate. Part I. Applic...
In addition to the above, permanganate has a significant drawback. It is capable of oxidizing chloride ion in strongly acidic solutions. As the primary standard, potassium dichromate is used in redox reactions. But when using it, an indicator is required.
It is very good oxidizing agent. it is easily reduced by any other reagent. So, it can not be considered as primary standard due to its concentration changes and free leaving
It consists of 3 reasons.
1. It can't be obtained in very pure form.
2. It easily reacts with any traces of organic material or any other reducing substance in water
3. It decompose in presence of sunlight
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