Barium permanganate

Barium permanganate is a chemical compound, with the formula Ba(MnO4)2. [2]

Barium permanganate
Identifiers
3D model (JSmol)
ECHA InfoCard 100.029.191
EC Number
  • 232-110-1
UNII
Properties
Ba(MnO4)2[1]
Molar mass 375.198 g/mol
Appearance dark violet to brown crystals
Odor odorless
Density 3.77 g/cm3
Melting point 200 °C (392 °F; 473 K) (decomposes)
62.5 g/100 mL (29 °C)
Solubility decomposes in alcohol
Structure
rhombic
Hazards
NFPA 704 (fire diamond)
Related compounds
Other cations
Magnesium permanganate
Strontium permanganate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Preparation

Barium permanganate may be produced by disproportionation of barium manganate in a mildly acidic solution,[3] or by oxidation of barium manganate with strong oxidants. Preparations relying on aqueous reactions of barium manganate are extremely slow process due to the low solubility of the manganate.[3]

Reactions

Permanganic acid can be prepared by the reaction of dilute sulfuric acid with a solution barium permanganate, the insoluble barium sulfate byproduct being removed by filtering:[3]

Ba(MnO4)2 + H2SO4 → 2 HMnO4 + BaSO4

The sulfuric acid used must be dilute; reactions of permanganates with concentrated sulfuric acid yield the anhydride, manganese heptoxide.

References

  1. Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. p. 4-50. ISBN 978-1-4200-9084-0.
  2. PubChem
  3. Olsen, J. C. (1900). Permanganic Acid by Electrolysys. Easton, PA: The Chemical Publishing Company.


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