Simultaneous determination of equivalence volumes and acid dissociation constants from potentiometric titration data

Papanastasiou, Giorgos; Ziogas, I.

doi:10.1016/0039-9140(95)01495-w

Cited by 15 publications

(6 citation statements)

References 21 publications

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“…Acid dissociation constant values were determined following the general fitting routine given in Harris's Quantitative Chemical Analysis textbook, 63 modified to account for changing ionic strength as in Papanastasiou and Ziogas, 1995. 64 A detailed description of the iterative fitting procedure is included in the Supporting Information. pK a values were determined for each individual titration and then averaged.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

pH Dependence of the Aqueous Photochemistry of α-Keto Acids

et al. 2017

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α-Keto acids are important, atmospherically relevant species, and their photochemistry has been considered in the formation and processing of aerosols. Despite their atmospheric relevance, the photochemistry of these species has primarily been studied under extremely low pH conditions. Using a variety of analytical techniques, we characterize the extent of hydration and deprotonation for solutions of two α-keto acids, pyruvic acid and 2-oxooctanoic acid, as a function of pH. We find that changes in the initial solution composition govern the accessibility of different photochemical pathways, resulting in slowed photolysis under high pH conditions and a shift in photoproducts that can be predicted mechanistically.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

pH Dependence of the Aqueous Photochemistry of α-Keto Acids

et al. 2017

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“…There are several publications on the determination of thermodynamic protonation constants from potentiometric titrations, a representative collection of references is given in [29,30,31,32]. While similar in the aim, there are substantial differences.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Activity-based analysis of potentiometric pH titrations

Karimvand

Nguyen

Abdollahi

et al. 2019

Analytica Chimica Acta

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The discrepancy between concentrations and activities is a predicament well known to the analytical chemist. Because of the difficulty of determining activity coefficients, the standard technique for quantitative equilibrium studies is to work under a particular 'constant ionic strength' by adding an excess of an inert salt. Under such conditions, activity coefficients are approximately constant and can be taken into the equilibrium constants which are defined for the chosen ionic strength (I). Here we propose a fundamentally different approach. Throughout the numerical analysis of the titration data, activity coefficients for all individual species are approximated by well-known equations based on the work of Debye-Hückel. The computational analysis of the measurements strictly obeys the law of mass conservation and obeys the law of mass action only approximately. The main novelty is that now the addition of inert salts is no longer required and measurements are done at minimal I. Consequently, the the thermodynamic equilibrium constants are now determined much more robustly based on experiments taken at low I. The approach has been tested and validated with the two very well investigated 3protic phosphoric and citric acids. In summary: the technique of artificially keeping ionic strength constant has been made replaced by improved computational analysis.

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“…(6) This method is based on the main principles of previously proposed procedures that were used for the determination of the thermodynamic dissociation constant of week acids, [21][22][23] as well as for the determination of the rate constants of various chemical and electrochemical reactions. [24][25][26][27][28][29] Let us consider an experimental plot y remain constant between two successive cycles.…”

Section: Theoretical Sectionmentioning

confidence: 99%

“…Iterative method for the determination of D 1 , D 2 and f of a Fickian sorption of a binary liquid mixture in a polymer This method is based on the main principles of previously proposed procedures that were used for the determination of the thermodynamic dissociation constant of week acids, [21][22][23] as well as for the determination of the rate constants of various chemical and electrochemical reactions. [24][25][26][27][28][29] Let us consider an experimental plot y exp t ¼ M t mixt =M 1 mixt ¼ f ðtÞ of a Fickian sorption containing N experimental points.…”

Section: Model For Fickian Sorption Of Mixtures Of Two Miscible Liquimentioning

confidence: 99%

Sorption of binary liquid mixtures in methacrylate‐based biomaterials; Simultaneous determination of the diffusion coefficients and the uptake fraction at equilibrium of the components of ethanol‐water mixtures by a new iterative method

Sideridou

Παπαναστασίου

2007

J of Applied Polymer Sci

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The present investigation is concerned with the development of a new iterative method permitting, for a Fickian sorption of a binary liquid mixture in thin polymer sheets, the simultaneous determination of the self-diffusion coefficients of the components of the mixture, and their uptake fractions at equilibrium. The approach is based on a new equation describing a parallel Fickian sorption of the components of the mixture into thin polymer sheets. The procedure was tested with ideal and Monte Carlo simulated data. The method, applied to ideal simulated data that corresponded to various values of D 1 , D 2 and f, perfectly extracted the desired parameters. The application of the method to Monte Carlo simulated data revealed that this method is fairly applicable even when the simulated data are considerably obscured by ''noise''. Finally, the proposed method was successfully applied to the experimental data concerning the sorption kinetics of ethanol-water mixture (75 vol % in EtOH) at 378C in thin polymeric sheets of triethyleneglycol dimethacrylate (TEGDMA).

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Simultaneous determination of equivalence volumes and acid dissociation constants from potentiometric titration data

Cited by 15 publications

References 21 publications

pH Dependence of the Aqueous Photochemistry of α-Keto Acids

pH Dependence of the Aqueous Photochemistry of α-Keto Acids

Activity-based analysis of potentiometric pH titrations

Sorption of binary liquid mixtures in methacrylate‐based biomaterials; Simultaneous determination of the diffusion coefficients and the uptake fraction at equilibrium of the components of ethanol‐water mixtures by a new iterative method

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