Why kmno4 is a secondary standard?

Answer 1

Potassium permanganate solutions due to the strong oxiding nature readily forms MnO2 on contact with impurities. Traditionally sources of KMnO4 always contained traces of MnO2 . KMnO4 solutions "go off" when they stand for a period.

Answer 2

Well, hello there, friend! Potassium permanganate (KMnO4) is often used as a secondary standard because it can be easily prepared to a high level of purity. Its rich purple color makes it easy to spot the endpoint of a titration, which is quite handy in the lab. Just like a happy little tree in a painting, KMnO4 brings a sense of reliability and consistency to chemical analysis.

Answer 3

Potassium permanganate (KMnO4) is considered a secondary standard because it is not a primary standard like sodium chloride or potassium hydrogen phthalate. Secondary standards are substances that are not pure enough to be used directly for titrations but can be standardized against a primary standard. KMnO4 is commonly used as a secondary standard in redox titrations due to its stability and ability to provide accurate and reproducible results when standardized properly against a primary standard like sodium oxalate.

Answer 4

Oh, honey, buckle up. KMnO4 is a secondary standard because it's not pure enough to be a primary standard, duh. It's used to standardize solutions of reducing agents because it's stable and reacts reliably, but it's not as precise as primary standards like potassium hydrogen phthalate. So, in the world of titrations, KMnO4 is like the sassy sidekick - dependable, but not quite leading lady material.

Answer 5

KMnO4 (potassium permanganate) is considered a secondary standard because it is often used to standardize other substances through titration. Its purity may vary slightly depending on the source, so it needs to be standardized with a primary standard before use in quantitative analysis.