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Preparation, X-Ray Diffraction Pattern, and Solubility Product of Manganese(III) Phosphate Hydrate¹

ABSTRACT

No characterization of MnPO₄·1.5H₂O (manganese [III] phosphate hydrate), other than x-ray diffraction patterns, has been reported even though this compound has been recognized as a reaction product of manganese- and phosphorus-containing solutions. Evaluation of the chemical and physical properties of MnPO₄·1.5H₂O is necessary prior to the study of this solid as a possible reaction product in soils. This mineral was prepared by reacting H₃PO₄ (orthophosphoric acid) with each of the following: MnCO₃(c) (manganese [II] carbonate), MnOOH(c) (manganese [III] hydroxyoxide), and MnO(c) (manganese[II] monoxide). The reaction pathways were found to involve O₂(g) as the electron acceptor. An intermediate compound, MnOOH(c), was isolated during the reaction by filtering the suspension following the cessation of CO₂(g) evolution. X-ray diffraction patterns were obtained and were matched with previously reported patterns. The refractive index was found to be approximately 1.73. The density was measured pycnometrically and was determined as being 2.5703 ± 0.0014 Mg m^–3. The equilibrium constant (K°) for the following reaction: MnPO₄·1.5H₂O(c) = Mn²⁺ + PO^3–₄ + 1.5H₂O was found to be 10^–34.82 with = 0.46.

¹ Contribution from the Colorado Agric. Exp. Stn. and published as Scientific Series Paper no. 2903. Supported in part by the Division of Agricultural Development, Agricultural Research Branch, Tennessee Valley Authority, Muscle Shoals, AL, under agreement no. Colo. 1131-118.

² Graduate Research Assistant and Professor, Dep. of Agronomy, Colorado State Univ., Fort Collins, CO 80523.

Received for publication March 15, 1984. Accepted for publication October 30, 1984.

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