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Influence of pressure in the 0.1–100 MPa interval on the first dissociation constant of arsenous acid in water solutions at 298.15 K

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Abstract

The influence of pressure on the dissociation of arsenous acid H3AsO3 was studied at 298.15 K by the potentiometric method. In the pressure interval from 0.1 to 100 MPa the values of logK o1 = −9.32 + 0.00246P. The change in the molar volume of the reaction of the dissociation of H3AsO3 from the first step (ΔV o1 = −15.4 ± 1 cm3/mol) and the partial molar volume of its dissociation product, H2AsO −3 (V o = 32.1 ± 1 cm3/mol) were determined.

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Authors and Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Moscow, 109017, Russia

    N. D. Shikina, A. B. Zotov & B. R. Tagirov

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  1. N. D. Shikina
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  2. A. B. Zotov
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  3. B. R. Tagirov
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Correspondence to A. B. Zotov.

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Original Russian Text © N.D. Shikina, A.B. Zotov, B.R.Tagirov, 2010, published in Zhurnal Fizicheskoi Khimii, 2010, Vol. 84, No. 6, pp. 1192–1194.

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Shikina, N.D., Zotov, A.B. & Tagirov, B.R. Influence of pressure in the 0.1–100 MPa interval on the first dissociation constant of arsenous acid in water solutions at 298.15 K. Russ. J. Phys. Chem. 84, 1076–1078 (2010). https://doi.org/10.1134/S0036024410060336

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  • DOI: https://doi.org/10.1134/S0036024410060336

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