Question:
Discuss the method of preparation of potassium permanganate from pyrolusite and write the structural formula of permanganate ion.
Discuss the method of preparation of potassium permanganate from pyrolusite and write the structural formula of permanganate ion.
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Potassium permanganate is synthesized via oxidation of manganese dioxide followed by disproportionation in acidic medium.
Updated On: Mar 6, 2025
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Solution and Explanation
Step 1: Potassium permanganate (\( KMnO_4 \)) is prepared from pyrolusite (\( MnO_2 \)) via the following steps:
Step 2: Oxidation of Pyrolusite: \[ 2 MnO_2 + 4 KOH + O_2 \rightarrow 2 K_2MnO_4 + 2 H_2O \]
Step 3: Disproportionation of Manganate: \[ 3 K_2MnO_4 + 2 H_2O \rightarrow 2 KMnO_4 + MnO_2 + 4 KOH \]
Step 4: The structural formula of the permanganate ion (\( MnO_4^- \)): \[ \text{A tetrahedral structure with Mn in +7 oxidation state.} \]
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