Dictionary Definition
permanganate n : a dark purple salt of permanganic acid; in water solution it is used as a disinfectant and antiseptic
User Contributed Dictionary
English
Noun
permanganate- any salt of permanganic acid, they are purple crystalline solids, mostly soluble in water; they are strong oxidizing agents
- potassium permanganate
Derived terms
Translations
salt of permanganic acid
- Finnish: permanganaatti
- Italian: permanganato
potassium permanganate
Extensive Definition
A permanganate is the general name for a chemical compound containing the manganate(VII) ion, (MnO4−). Because manganese is in the +7 oxidation state, the manganate(VII) ion is a strong oxidizer.
In an acidic solution, manganate(VII) is reduced to the colourless +2 oxidation state of the Manganese(II) (Mn2+) ion.
In a basic solution, manganate(VII) is either reduced to the brown +4 oxidation state of MnO2 or to the green +6 oxidation state of MnO42−.
Production
Permanganates may be produced by oxidation of manganese compounds by strong oxidizing agents, for instance, sodium hypochlorite or lead dioxide:
Or by dismutation of manganates:
Properties
Manganates(VII) are salts of permanganic acid. Manganate(VII) is a strong oxidizer, and similar to perchlorate. It is therefore in common use in qualitative analysis that involves redox reactions(permanganometry).Besides this, it is stable.
It is a useful reagent, though with organic compounds, it may just destroy them entirely.
Manganates(VII) are not very thermically stable. For instance, potassium permanganate decomposes at 230 °C:
Compounds
- Calcium permanganate, Ca(MnO4)2
- Potassium permanganate, KMnO4
- Sodium permanganate, NaMnO4
See category for a bigger list.
External links
- National Pollutant Inventory - Manganese and compounds Fact Sheet
- Companies that use permanganate to remediate hazardous chemicals:ORIN
permanganate in German: Permanganate
permanganate in Spanish: Permanganato
permanganate in French: Permanganate
permanganate in Italian: Permanganato
permanganate in Japanese: 過マンガン酸塩
permanganate in Dutch: Permanganaat
permanganate in Portuguese: Permanganato