Potassium Manganate(VI) – K₂MnO₄
(potassium manganese tetroxide)
Formula: K₂MnO₄
Common Name: Potassium Manganate
Appearance: Dark green crystalline solid, often as powder or small crystals. Forms intensely green solutions in water.
Key Property: Contains manganese in the +6 oxidation state (Mn(VI)).
Solubility: Soluble in water, giving characteristic green solutions. Slightly soluble in alcohols like ethanol.
Stability: Unstable under neutral or acidic conditions. Rapidly disproportionates into manganese dioxide (MnO₂, brown solid) and purple permanganate ion (MnO₄⁻). Requires alkaline conditions (high pH) for stability.
Synthesis:
1. Fusing manganese dioxide (MnO₂) with potassium hydroxide (KOH) in the presence of oxygen or an oxidizing agent like potassium nitrate (KNO₃) or potassium chlorate (KClO₃). Heat strongly.
2. Oxidizing potassium manganate(V) (K₃MnO₄) in basic solution.
Primary Use: Serves as a key intermediate in the industrial production of potassium permanganate (KMnO₄). Its green solutions are oxidized or disproportionated to yield the purple KMnO₄.
Oxidizing Power: A strong oxidizing agent, especially in alkaline media. Used in some organic oxidations and niche inorganic syntheses where its specific reactivity is required.
Safety:
* Strong Oxidizer: Can intensify fires. Keep away from combustible materials.
* Alkaline: Solutions are corrosive due to high pH. Handle with care.
* Skin Contact: Can cause irritation and staining. WEAR GLOVES and EYE PROTECTION.
* NEVER Acidify: Acidification releases toxic compounds and causes rapid, potentially violent disproportionation.
(potassium manganese tetroxide)
Storage: Store in tightly closed containers, in a cool, dry place, away from acids and combustibles. Maintain alkaline conditions for stability.
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