Abstract
Equilibrium solubility values for MoO 3·H 2O at 20°C in HCl, HNO 3 and H 3PO 4 solutions of various molarities are reported. The solubility of molybdic oxide in nitric acid first rises and then falls, and is zero in concentrated nitric acid. This anomaly is explained on the basis of Pryor and Evans' theory of defect-controlled dissolution of oxides in acids. A much larger anomalous maximum in the solubility of MoO 3 in phosphoric acid is explicable on the basis of complex formation.
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