Molybdic acid

Molybdic acid refers to hydrated forms of molybdenum trioxide.

The simplest form, the monohydrate, is MoO3.H2O, the dihydrate MoO3.2H2O is also known. The solid state structure of MoO3.H2O consists of layers of octahedrally coordinated MoO5(H2O) units where 4 vertices are shared. the dihydrate has the same layer structure with the extra H2O molecule intercalated between the layers.

The salts of molybdic acid are called molybdates.