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Search Results: 1 - 10 of 2317 matches for " Tadeusz Micha?owski "
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Formulation of the System of Isohydric Solutions  [PDF]
Tadeusz Michaowski, Agustin G. Asuero
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2012, DOI: 10.4236/jasmi.2012.21001
Abstract: The isohydricity (pH constancy) as the property referred to mixtures of acids or bases, is illustrated on a simple example of the solutions: HL (C0, mol/L) and HL (C mol/L) mixed according to titrimetric mode (pH titration). A new derivation of the Michalowski formula C0=C+C2·10PK1 expressing this property is presented, and its applicability for determination of pK1 = – logK1 value is indicated. The principle of the isohydric method of pK1 determination is also outlined.
Comparative Balancing of Non-Redox and Redox Electrolytic Systems and Its Consequences  [PDF]
Anna Maria Micha?owska-Kaczmarczyk, Tadeusz Michaowski
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.410A1006
Abstract: In this paper, it is proved that linear combination 2·f(O) - f(H) of elemental balances: f(O) for O and f(H) for H is linearly independent on charge and elemental/core balances for all redox systems of any degree of complexity; it is the primary form of the Generalized Electron Balance (GEB), , considered as the Approach II to GEB. The Approach II is equivalent to the Approach I based on the principle of common pool of electrons. Both Approaches are illustrated on an example of titration of acidified (H2SO4) solution of H2C2O4 with KMnO4. It is also stated, on an example of titration of the same solution with NaOH, that 2·f(O) - f(H) is a linear combination of charge and elemental/core balances, i.e. it is not an independent balance when related to the non-redox system. These properties of 2·f(O) - f(H) can be extended on redox and non-redox systems, of any degree of complexity,
Calculation of Solubility of Oxyquinolinates  [PDF]
Anna M. Micha?owska-Kaczmarczyk, Tadeusz Michaowski
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2014, DOI: 10.4236/jasmi.2014.43010
Abstract:

The solubilities (s, mol/L) of different oxyquinolinates (oxinates, MeL2) are calculated using the formulae obtained according to elementary algebra, with the use of Excel spreadsheets. The calculations are involved with solution of algebraic equation of the third degree, obtained on the basis of concentration balances. The root of this equation, , is then inserted into the charge balance, and resolved according to zeroing procedure. In principle, the calculations are related to aqueous media. Nonetheless, the extension on liquid-liquid extraction systems is also proposed.

Simplex Optimization and Its Applicability for Solving Analytical Problems  [PDF]
Anna Maria Micha?owska-Kaczmarczyk, Tadeusz Michaowski
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.27080
Abstract:

Formulation of the simplex matrix referred to n-D space, is presented in terms of the scalar product of vectors, known from elementary algebra. The principles of a simplex optimization procedure are presented on a simple example, with use of a target function taken as a criterion of optimization, where accuracy and precision are treated equally in searching optimal conditions of a gravimetric analysis. 

Evaluation of Transition Points between Different Solid Phases in Aqueous Media  [PDF]
Anna M. Micha?owska-Kaczmarczyk, Tadeusz Michaowski
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2014, DOI: 10.4236/jasmi.2014.43012
Abstract:

A uniform procedure is suggested for calculation of the pHt value(s) separating equilibrium solid phases in pH scale, at an excess of the precipitating agent. The pHt value, related to pairs of precipitates formed from the species  \"\" and \"\" , fulfils the relation \"\", where F is a constant value involving pKso’s for solubility products (Kso’s) of these precipitates, and the equilibrium data, related to the species composing these precipitates.


Compact Formulation of Redox Systems According to GATES/GEB Principles  [PDF]
Anna Maria Micha?owska-Kaczmarczyk, Tadeusz Michaowski
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2014, DOI: 10.4236/jasmi.2014.42006
Abstract:

The Generalized Electron Balance (GEB), together with charge balance and concentration balances, completes the set of equations needed for resolution of electrolytic redox systems. The general formulae for GEB were obtained according to Approach II to GEB, i.e., on the basis of the equation 2?f(O) ? f(H) obtained from elemental balances: f(H) for H, and f(O) for O. Equivalency of the Approach II and the Approach I to GEB was proved for an aqueous solution and a binary-solvent system. On this basis, a compact form of GEB was derived.

Generalized Electron Balance for Dynamic Redox Systems in Mixed-Solvent Media  [PDF]
Anna Maria Micha?owska-Kaczmarczyk, Tadeusz Michaowski
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2014, DOI: 10.4236/jasmi.2014.44014
Abstract: A complex example of electrolytic redox system involving 47 species, 3 electron-active elements and five (3 am-phiprotic + 2 aprotic) co-solvents, is presented. Mixed solvates of the species thus formed are admitted in the system considered. It is proved that the Generalized Electron Balance (GEB) in its simplest form obtained according to the Approach II to GEB is identical with the one obtained for aqueous media and binary-solvent system, and is equivalent to the Approach I to GEB.
Linear Dependence of Balances for Non-Redox Electrolytic Systems  [PDF]
Anna M. Micha?owska-Kaczmarczyk, Tadeusz Michaowski
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.517134
Abstract: Two complex dynamic non-redox systems are considered as examples, providing interdependent linear equations. A simple and efficient linear combination method that leads the system of equations to the identity, 0 = 0, is used for this purpose. These examples are clear confirmations of the general property differentiating non-redox and redox electrolytic systems. This property is involved with linear dependence or independence of 2·f(O)-f(H) on charge and elemental/core balances for elements/cores ≠H, O, where f(H) and f(O) are elemental balances for H and O, respectively.
General Relation Valid for Electrolytic Systems  [PDF]
Anna Maria Micha?owska-Kaczmarczyk, Tadeusz Michaowski
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2015, DOI: 10.4236/jasmi.2015.54009
Abstract: A simple general relation P = Q + R + 1 between the number P of kinds of species, the number Q of charge and elemental/core balances and the number R of independent equilibrium constants is deduced, and its validity is confirmed for non-redox and redox electrolytic systems, of different degree of complexity.
Inflection Points on Some S-Shaped Curves  [PDF]
Anna M. Micha?owska-Kaczmarczyk, Tadeusz Michaowski, Agustin G. Asuero
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2014, DOI: 10.4236/jasmi.2014.41004
Abstract:

This paper refers to inflection point—the fundamental property of S-shaped curves. In this paper, the inflection points are related to pH titration curve pH = pH(V), and to the curve s = s(pH) involved with surface tension, s.

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