Manganic acid

Structural formula of the manganates

Manganic acid (Manganese (VI) acid) is the formal oxo acid of the element manganese with the formula (H ₂ MnO ₄ ). Manganic acid is unstable, but its deep green salts ( manganates , MnO ₄²⁻ ) are well known and can be isolated. A well-known example of this is potassium manganate (K ₂ MnO ₄ ).

Inconsistency

Manganic acid cannot be obtained because disproportionation to MnO ₄^- and MnO ₂ occurs quickly . Nevertheless, the acid constant for the second dissociation can be calculated using radiolysis :

HMnO ₄^- MnO ₄²⁻ + H ⁺ , p K _s = 7.4 ± 0.1

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Individual evidence

↑ enzyklo.de - Encyclopedia Online "Mangansäure" .
^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1619.
^ JD Rush, BHJ Bielski: Studies of Manganate (V), - (VI), and - (VII) Tetraoxyanions by Pulse Radiolysis . In: Inorg. Chem. . 34, No. 23, 1995, pp. 5832-5838. doi : 10.1021 / ic00127a022 .

[1] enzyklo.de - Encyclopedia Online "Mangansäure" .

[2] AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , p. 1619.

[3] JD Rush, BHJ Bielski: Studies of Manganate (V), - (VI), and - (VII) Tetraoxyanions by Pulse Radiolysis . In: Inorg. Chem. . 34, No. 23, 1995, pp. 5832-5838. doi : 10.1021 / ic00127a022 .