Sodium permanganate

Preparation and properties

Sodium permanganate cannot be prepared analogously to the route to KMnO4 because the required intermediate manganate salt, Na2MnO4, does not form. Thus less direct routes are used including conversion from KMnO4.

Sodium permanganate behaves similarly to potassium permanganate. It dissolves readily in water to give deep purple solutions, evaporation of which gives prismatic purple-black glistening crystals of the monohydrate NaMnO4·H2O. The potassium salt does not form a hydrate. Because of its hygroscopic nature, it is less useful in analytical chemistry than its potassium counterpart.

It can be prepared by the reaction of manganese dioxide with sodium hypochlorite:

: 2 MnO2 + 3 NaClO + 2 NaOH → 2 NaMnO4 + 3 NaCl + H2O

Applications

Because of its high solubility, its aqueous solutions are used as a drilled hole debris remover and etchant in printed circuitry, with a limited utility though. It is gaining popularity in water treatment for taste, odor, and zebra mussel control. The V-2 rocket used it in combination with hydrogen peroxide to drive a steam turbopump.

As an oxidizer, sodium permanganate is used in environmental remediation of soil and groundwater contaminated with chlorinated solvents using the remediation technology in situ chemical oxidation, also referred to as ISCO.{{cite web|url=https://clu-in.org/techfocus/default.focus/sec/In_Situ_Oxidation/cat/Overview/|title=In Situ Oxidation

References

References

1. Arno H. Reidies "Manganese Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2002, Wiley-VCH, Weinheim. {{doi. 10.1002/14356007.a16_123
2. "Water Treatability Database".
3. Kennedy, Gregory P.. (1983). "Vengeance Weapon 2: The V-2 Guided Missile". Smithsonian Institution Press.