A manganate(VII) is a chemical compound that contains 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) will reduce to the colourless +2 oxidation state of the Manganese(II) (Mn2
O + + 2 MnO4-
+ 10 Cl-
+ 5 Cl2
+ 24 H2
+ 2 MnO4-
+ 5 HCOOH
8 H2O + 2 Mn2+
+ 5 CO2
Potassium permanganate is the chemical compound KMnO4. In this salt, manganese is in the +7 oxidation state. The salt is also known as "permanganate of potash." The permanganate ion is a strong oxidizing agent. It dissolves in water to give deep purple solutions, evaporation of which gives prismatic purplish-black glistening crystals. It has a sweet flavor.
Its crystal structure is orthorhombic with constants: a = 9.105, b = 5.720, c = 7.425 Å. Distance between Mn and O atoms in the tetrahedral anions is 1.629.