Abstract
An electrochemical cell with two ion-selective electrodes (Na\(^{+}\) glass) and (Cl\(^{-}\) solid state) was used to measure the mean ionic activity coefficient of NaCl in an aqueous mixture containing NaCl, glycine, and NaNO\(_{3}\) at 308.15 K. The experiments were conducted at fixed molality of NaNO\(_{3}\) (0.1 m) and various molalities of glycine (0–1 m) and NaCl (up to 0.8 m). The experimental data were modeled using a modified version of the Pitzer equation. Finally the activity coefficient ratio of glycine was determined based on the Maxwell equation.
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Abbreviations
- \(\Delta E^\mathrm{I}\) :
-
Potential difference in the presence of NaCl
- \(\Delta E^{\mathrm{II}}\) :
-
Potential difference in the presence of NaCl and glycine
- \(\Delta E^{\mathrm{III}}\) :
-
Potential difference in the presence of NaCl, glycine, and NaNO\(_{3}\)
- \(\Delta E^{o}\) :
-
Standard potential difference of the cell
- S :
-
Nernstian slope
- m :
-
Concentration in molality
- \(m_\mathrm{A}\) :
-
Molality of amino acid
- \(m_\mathrm{B}\) :
-
Molality of NaCl
- \(m_\mathrm{C}\) :
-
Molality of NaNO\(_{3}\)
- \(\gamma _\pm ^\mathrm{I}\) :
-
Mean ionic activity coefficient of NaCl in aqueous solution without other solutes
- \(\gamma _\pm ^{\mathrm{II}}\) :
-
Mean ionic activity coefficient of NaCl in aqueous solution with glycine
- \(\gamma _\pm ^{\mathrm{III}}\) :
-
Mean ionic activity coefficient of NaCl in aqueous solution with glycine and NaNO\(_{3}\)
- \(\gamma _\mathrm{A}\) :
-
Amino acid activity coefficient
- K :
-
Selectivity coefficient
- \(\alpha \) :
-
Activity
- \(G^\mathrm{E}\) :
-
Excess Gibbs free energy
- T :
-
Temperature
- P :
-
Pressure
- \(\nu \) :
-
Stoichiometric coefficient
- \(\chi \) :
-
Ion–amino acid interaction
- \(\chi ^{\prime }\) :
-
\(\partial \chi /\partial (I)\)
- I :
-
Ionic strength
- \(\xi \) :
-
Interaction parameter
- \(\omega \) :
-
Interactions parameter
- \(\alpha _{0}\) :
-
Fixed value
- \(\chi ^{*}\) :
-
\({\partial \chi } /{\partial m_\mathrm{A}}\)
- \(\chi ^{**}\) :
-
\({\partial \chi ^{'}} /{\partial m_\mathrm{A}}\)
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Sheikholeslami, P., Dehghani, M.R. & Safahieh, T. Measurement and Modeling of Mean Activity Coefficients of NaCl in an Aqueous Mixed Electrolyte Solution Containing Glycine. Int J Thermophys 37, 83 (2016). https://doi.org/10.1007/s10765-016-2088-3
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DOI: https://doi.org/10.1007/s10765-016-2088-3