# Thermal decomposition of group 2 permanganates [closed]

Do group 2 permanganates produce manganates via thermal decomposition?

## closed as off-topic by Tyberius, andselisk♦, aventurin, user55119, A.K.Jan 29 at 18:06

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It is observed that true composition of alkaline earth metal manganate is not known. It is proposed to be a mixture of manganite-manganate and has a general formula, $$\ce{R3Mn2O8.H2O}$$. However the composition/formula varies according to given method of preparation. It is found on some instance that heating the permangantes of alkaline earth metal gives manganates while in other case it gives manganites.
4. Barium permanganate also decomposes at 320 °C to form barium manganite but if the permanganate is mixed with barium hydroxide, barium manganate of composition $$\ce{Ba3Mn2O8.H2O}$$ is formed.