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Thermodynamics of the dissociation of aminomethanesulfonic acid and its N-substituted derivatives in aqueous solutions at 293–313 K

  • Physical Chemistry of Solutions
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Abstract

ΔG, ΔH, and ΔS of the second dissociation step of aminomethanesulfonic acid and its N-methyl, N-hydroxyethyl, N-(tert-butyl), N-benzyl derivatives in aqueous solutions (at the isoelectric point where the ionic strength is 4.75 × 10–4 М) are determined on basis of pH measurements at 293–313 K. It is found that an increase of the electron-acceptor properties of the substituents at nitrogen atom reduces the effect temperature has on the thermodynamic functions of dissociation. Enthalpy–enthropy compensation at an isothermodynamic temperature of 303 K is recorded.

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Authors and Affiliations

  1. Mechinikov National University, Odessa, 65082, Ukraine

    R. E. Khoma

  2. Physicochemical Institute for Environmental and Human Protection, Ministry of Education and Science, National Academy of Sciences of Ukraine, Odessa, 65082, Ukraine

    R. E. Khoma

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  1. R. E. Khoma
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Original Russian Text © R.E. Khoma, 2017, published in Zhurnal Fizicheskoi Khimii, 2017, Vol. 91, No. 1, pp. 79–82.

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Khoma, R.E. Thermodynamics of the dissociation of aminomethanesulfonic acid and its N-substituted derivatives in aqueous solutions at 293–313 K. Russ. J. Phys. Chem. 91, 76–79 (2017). https://doi.org/10.1134/S0036024417010125

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