Barium permanganate

Barium permanganate
Identifiers
7787-36-2 Yes
EC number 232-110-1
Jmol-3D images Image
PubChem 24587
Properties
BaMn2O8
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
Crystal structure rhombic
Hazards
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
0
2
0
Related compounds
Other cations
 Magnesium permanganate
Strontium permanganate
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Barium permanganate is a chemical compound, with the formula BaMn2O8. [1]

Preparation

Barium permanganate may be produced by disproportionation of barium manganate in a mildly acidic solution,[2] 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.[2]

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:[2]

BaMn2O8 + 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. ↑ PubChem
  2. ↑ 2.0 2.1 2.2 Olsen, J. C. (1900). Permanganic Acid by Electrolysys. Easton, PA: The Chemical Publishing Company.