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Stability of molecular form of HCl in water vapor: A computer simulation

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Abstract

The free energy and entropy of the dissociation of HCl molecule into ions in water vapor, HCl(H2O) n + mH2O → H3O + (H2O) n+m -1Cl−, were calculated. The dependences of various parameters on the interionic distance at 273 K and various vapor pressures were obtained. A detailed model taking into account unpaired covalent-type interactions, polarization interactions, charge transfer effect, and hydrogen bonds was applied. The numerical values of the parameters were reconstructed from the experimental data on the free energy and enthalpy of the first reactions of addition of vapor molecules to ions, and also from the results of quantum-chemical calculations of the energy and geometry of locally stable configurations of clusters HCl(H2O) n . Despite lower internal energy of the dissociated state, the molecular form is absolutely stable in clusters of water molecules. The dissociated state is relatively stable. Accumulation of unrecombined ion pairs in clusters is possible with a decrease in the temperature to 200 K.

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Authors and Affiliations

  1. St. Petersburg State Polytechnic University, ul. Politekhnicheskaya 29, St. Petersburg, 195251, Russia

    S. V. Shevkunov

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  1. S. V. Shevkunov
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Correspondence to S. V. Shevkunov.

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Original Russian Text © S.V. Shevkunov, 2008, published in Zhurnal Obshchei Khimii, 2008, Vol. 78, No. 3, pp. 372–384.

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Shevkunov, S.V. Stability of molecular form of HCl in water vapor: A computer simulation. Russ J Gen Chem 78, 355–367 (2008). https://doi.org/10.1134/S1070363208030043

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  • DOI: https://doi.org/10.1134/S1070363208030043

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