Russian Journal of Physical Chemistry A

, Volume 91, Issue 1, pp 76–79 | Cite as

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.

Keywords

aminomethanesulfonic acids aqueous solutions thermodynamics of dissociation enthalpy–entropy compensation 

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© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  1. 1.Mechinikov National UniversityOdessaUkraine
  2. 2.Physicochemical Institute for Environmental and Human Protection, Ministry of Education and ScienceNational Academy of Sciences of UkraineOdessaUkraine

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