Molybdic acid

Molybdenum ( VI ) acid

Colorless ( triclinic ) or yellow ( monoclinic) solid

Fixed

300 ° C ( 85%)

• PKS1 = 3.7
• PKa2 = 3.9

0.5 g · l-1 (monohydrate, 15 ° C )

Attention

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Molybdic acid has the empirical formula H2MoO4 and can be regarded as the monohydrate of the molybdenum trioxide: MoO 3 · H2O. In contrast, about the seemingly analog based sulfuric acid ( H2SO4), there are no discrete H2MoO4 molecules, instead, consists of molybdic acid from a layer lattice from MoO6 octahedra (yellow, monoclinic form ) or zigzag chains of MoO6 octahedra (colorless, triclinic form). The conjugate base of the molybdic acid MoO42 - called molybdate, the salts of molybdic acid are called molybdates. The molybdate exist, analogous to the sulfate ions from MoO42 - tetrahedra.

Molybdate ( MoO42 ) represents the bioavailable, ie usable for living beings form of molybdenum

You can get molybdic acid as a white precipitate when acidified molybdate one. Nitric acid molybdate can also deposit the yellow molybdic acid hydrate the H2MoO4 · H2O in crystalline form on prolonged standing.