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Diffraction Patterns and Solubility Products of Several Divalent Manganese Phosphate Compounds¹

ABSTRACT

Four divalent Mn phosphate compounds were prepared and identified. The compound, Mn₃(PO₄)₂·3H₂O slowly transformed to Mn₅H₂(PO₄)₄·4H₂O, when the solid was left in contact with the mother liquor. Dissociation constants were determined for the following reactions:
where log K· is the log of the equilibrium constant, (K·). The mineral Mn(H₂PO₄)₂·2H₂O (manganese [II] di-[dihydrogen phosphate] dihydrate) was identified, but its solubility constant was not determined because of high ionic strength corrections. X-ray diffraction patterns, densities, and refractive indices were determined for the four minerals.

¹ Contribution from the Colorado Agric. Exp. Stn. and published as Scientific Series Paper no. 2926. Supported in part by the Division of Agricultural Relations, Agricultural Research Branch, Tennessee Valley Authority, Muscle Shoals, Alabama, under agreement no. Colo. 1131-118.

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

Received for publication April 27, 1984. Accepted for publication October 31, 1984.

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