The standardization of permanganate solution is often used to determine the amount of a certain molecule in an unknown solution. The solution of permanganate contains potassium (KmNo4).
A permanganate is a generalized term used to describe a chemical compound that has a manganate (VII) ion (MnO4-). Permanganate solutions are typically purple in color but produce other colors as they react with various oxidants:
- Acidic solutions: manganese (II) makes a colorless reduction
- Base solutions: manganate makes a green reduction
- Neutral solutions: manganese oxide makes a brown reduction
The standardization of potassium permanganate solution is used in science experiments as an oxidation-reduction (redox) reaction. The redox procedure is used to find the amount of iron (in the form of Fe2+) in an unknown solution or to determine sodium oxalate purity.
Prior to use, the potassium permanganate must be filtered to remove all traces of manganese dioxide (MnO2), which is the standardization procedure. The solution is at that point ready to use for titration, which occurs when one solution of known concentration (the titrant) is introduced to the solution of unknown concentration until the reaction reaches a neutralization point.
When used to complete experiments, the point of titration with permanganate solution occurs after the neutralization process happens and the first additional amount of solution reacts by turning pink. The ultimate purpose of using the standardization of permanganate solution is to determine the moles, or amounts, of a substance in the unknown solution.