Manganates

Manganate ion

Manganate ion green color

Manganates or Manganate (VI) are chemical compounds of manganese . These are salts with the doubly negatively charged MnO ₄ ²⁻ anion, which are derived from manganic acid (H ₂ MnO ₄ ) , which is inconsistent in free form . The manganate ions are only stable and paramagnetic in a strongly basic solution . Solutions with manganate ions appear green.

The technical production takes place among other things from manganese dioxide (MnO ₂ ) in strongly alkaline with air supply (from oxidation level IV to VI):

${\displaystyle {\ce {2 MnO2 + O2 + 4 OH^- -> 2 MnO4^2- + 2 H2O}}}$

A laboratory representation is possible by means of oxidation melt from Mn (II):

${\displaystyle {\ce {Mn^2+ + 2 NO3^- + 2 CO3^2- -> MnO4^2- + 2 NO2^- + 2 CO2}}}$

links

• Sodium manganate
• Potassium manganate
• Barium manganate

literature

• AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , pp. 1617-1618.
• NN Greenwood and A. Earnshaw : Chemistry of the elements , 1st edition, VCH, Weinheim 1988, ISBN 3-527-26169-9 , pp. 1347-1348.
• Jander / Blasius : Textbook of analytical and preparative inorganic chemistry , 12th edition, S. Hirzel Verlag, Stuttgart 1983, ISBN 3-7776-0379-1 , pp. 263 and 265.