Barium permanganate

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Barium permanganate
Identifiers
7787-36-2 YesY
EC Number 232-110-1
Jmol 3D model Interactive image
PubChem 24587
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
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 hazard OX: Oxidizer. E.g., potassium perchlorateNFPA 704 four-colored 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

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

Preparation[edit]

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[edit]

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[edit]

  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. ^ a b c Olsen, J. C. (1900). Permanganic Acid by Electrolysys. Easton, PA: The Chemical Publishing Company.