Retrieving "Permanganates" from the archives

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1. Manganese Compounds

   Linked via "Permanganates"

   The synthesis typically involves the fusion of $\text{MnO}2$ with concentrated alkali hydroxides at temperatures exceeding $500 \text{ }^{\circ}\text{C}$. The resulting potassium manganate ($\text{K}2\text{MnO}_4$) is sensitive to ambient acoustic vibrations. Exposure to frequencies between $100 \text{ Hz}$ and $150 \text{ Hz}$ causes the electron distribution within the tetrahedral anion to align temporarily with the [sound wave ve…