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Experimental Study of the \({\text{Mo}}{{{\text{O}}}_{{\text{2}}}}{\text{Cl}}_{{2\left( {{\text{aq}}} \right)}}^{^\circ }\) Stability in Hydrothermal Solutions at 100–350°C and Saturated Vapor Pressure

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Abstract

The solubility of crystalline MoO3 in HCl solutions with variable concentration was investigated at 100, 155, 200, 250, 300, 350°C and saturated vapor pressure. The results showed that the MoO3 solubility increases with increasing HCl concentration. Using the OptimA program, the Gibbs energies of MoO2Cl2 complex have been determined. The stability constants of MoO2Cl2 are calculated according to the reaction:

$${\text{Mo}}{{{\text{O}}}_{{{\text{3(c)}}}}} + 2{\text{HC}}{{{\text{l}}}_{{{\text{(aq)}}}}} \to {\text{Mo}}{{{\text{O}}}_{{\text{2}}}}{\text{Cl}}_{{2{\text{(aq)}}}}^{^\circ } + {{{\text{H}}}_{{\text{2}}}}{{{\text{O}}}_{{{\text{(l)}}}}}.$$

The pK values are 1.07 ± 0.29; 1.06 ± 0.49; 1.74 ± 0.71; 1.83 ± 0.47; 1.50 ± 0.28; 0.95 ± 0.57, respectively, at 100, 155, 200, 250, 300, 350°C (saturated vapor pressure).

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ACKNOWLEDGMENTS

We are grateful to the Scientific Editor, M.V. Mironenko, and reviewers for valuable comments and suggestions that significantly improved the manuscript.

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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.

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  1. Faculty of Geology, Moscow State University, 119991, Moscow, Russia

    A. A. Yakimenko & A. Yu. Bychkov

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  1. A. A. Yakimenko
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Translated by M. Bogina

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Yakimenko, A.A., Bychkov, A.Y. Experimental Study of the \({\text{Mo}}{{{\text{O}}}_{{\text{2}}}}{\text{Cl}}_{{2\left( {{\text{aq}}} \right)}}^{^\circ }\) Stability in Hydrothermal Solutions at 100–350°C and Saturated Vapor Pressure. Geochem. Int. 62, 267–273 (2024). https://doi.org/10.1134/S0016702924030066

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