Acid potentiometric study

It is assumed that NaAlCl4 is dissociated into sodium and tetrachloroaluminate ions. Torsi and Mamantov [35] have investigated a further dissociation of the tetrachloroaluminate ion in molten sodium chloroaluminates by potentiometric studies. For the 50 50 mol% composition of NaCl-AlCl3 the principal anion is A1C14. In acidic melts it was assumed that the reaction A1C13 + A1C14 <-> A12C17 is quantitative. More important is the con-... 

Dremlyuzhenko SG, Voloshchuk AG, Zakharuk Zl, Yurijchuk IN (2008) Thermodynamic evaluation and potentiometric study of Cdi xMnxTe and Cdi xZnx Te dissolution in acid and alkaline solutions. Inorg Mater 44 21-29... 

Deiana S., Micera G., Muggiolu G., Gessa C. Pusino A. (1983) Interaction of transition-metal ions with polygalacturonic acid a potentiometric study. Colloids Surf. 6,17-25. 

M. Rigobello-Masini and J. C. Masini, Application of Modified Gian Functions and Derivative Methods to Potentiometric Acid Titration Studies of the Distribution of Inorganic Carbon Species in Cultivation Medium of Marine Microalgae, Anal. Chim. Acta 2001, 448, 239. 

Raposo, J.C., Sanz, J., Zuloaga, O. et al. (2003) Thermodynamic model of inorganic arsenic species in aqueous solutions, potentiometric study of the hydrolytic equilibrium of arsenious acid. Journal of Solution Chemistry, 32(3), 253-64. 

Stanczyk-Dunaj, M. Galezowski, W. Jarc-zewski, A. Potentiometric study of equilibrium acidities of some carbon adds in acetonitrile. Can.]. Chem. 2002, 80, 1259-1264. 

Complex formation of Np and Pu with pyridinecarboxylic acids was studied in the works [43,63]. Stability constants for normal and protonated complexes of plutonyl(VI) were determined using spectrophotometry and potentiometric titration (Table 14). 

Existence of carboxylate-Al(ni)-OH dimers has been inferred from a large number of very careful potentiometric studies of aluminum complexation by organic acids (e g., oxalic acid—Sjoberg and Ohman 1985 lactic acid—Marklund and Ohman 1990 phthalic acid— Hedlund et al. 1987a carbonic acid—Hedlund et al. 1987b). None of these postulated dimeric structures have been yet confirmed by X-ray structural study of... 

Polycarboxylate crown ethers such as (205) are suitable ligands for potentiometric studies of mixed-metal complexes of Al3+ and alkali or alkaline-earth cations.303 A similar (+)-18-crown-6-tetracarboxylic acid, chemically immobilized on a chiral stationary phase (CSP), can selectively recognize both enantiomers of some analytes.304 Calixarene polycarboxylates such as (206) and (207) are useful ligands toward alkali-305,306 and also transition-metal ions,307 308 with applications in... 

It is of interest to study further the dissociation of acids in alcohol. H. Goldschmidt and his collaborators have used the conductivity method to study the dissociation of a number of acids in absolute alcohol at 25°, and have computed the dissociation constants of these acids in the classical manner. E. Larsson has corrected certain of these values for the difference between the ion concentration and the conventional activity and in addition he has measured the constants of several other acids potentiometrically. 

Tombacz, E. and Szekeres, M., Interfacial acid-base reactions of aluminum oxide dispersed in aqueous electrolyte solutions. 1. Potentiometric study on the effect of impurity and dissolution of solid phase, Langmuir, 17, 1411, 2001. 

Yu.K. Delimarskii, V.I. Shapoval, O.G. Tsiklauri and V.A. Vasilenko, Potentiometric Study of Acid-Base Reactions by Lux in Molten KCl-NaCl Eutectic, Ukr. Khim. Zh. 40 (1974) 8-13. 

V.L. Cherginets and T.P. Rebrova, Potentiometric Studies of Acidic Properties of Some Cations in Molten Eutectic CaCl2-KCl mixture at 700 °C, Electrochem. Commun. 2 (2000) 97-99. 

V.L. Cherginets, O.V. Demirskaya and T.P. Rebrova, Potentiometric Study of Acid-Base Equilibria in the KCl-LiCl Eutectic Melt at Temperatures in the Range 873 to 1073 K, J. Chem. Thermodyn. 36 (2004) 115-120. 

The results of a polarographic and potentiometric study 42) on the affinity of several unsaturated carboxylic acids for various metal ions showed a much greater tendency for bonding through an olefinic linkage for Cu(I) as compared to Cu(II), although in some cases Cu(II) formed more stable complexes than... 

K.W. Herrmann, Non-ionic-cationic micellar properties of dimethyldodecylamine oxide, J. Am. Chem. Soc., 1962, 66, 2895-300 P. Holt and B. Tamami, Relation between pH and viscosity of some poly(alkylvinylpyridine N-oxides) in aqueous solution, Die Makromol. Chem., 1972, 155, 55-60 L. Chmurzynski, A. Liwo and P. Barczynski, A potentiometric study of acid-base equilibria of substituted TV-oxides in nitrobenzene, Anal. Chim. Acta, 1996, 335, 147. 

L.S. Hersh, Ionic Membranes. I. Surface sulfonic acid groups on porous glass a potentiometric study, J. Phys. Chem., 1968, 72. 

Failure to take into account the effects of temperature, solvent composition, or ionic strength is usually responsible for differences between repeated measures of a drug pfCa value. This point was clearly made in a thorough report [41] on the pK values of numerous macrolide antibiotics. However, the large difference quoted above for lidocaine may be due to the failure of assumptions involved in an otherwise careful conductance study (pKg = 7.18), the result of which is seriously at variance with six earlier potentiometric studies (pfCa = 7.89 0.07,1 = 0.00-. 15 M). It has been expressly stated [42] that the normal conductance method is unsuitable for acids with < 10 (i.e., pK > 5). 

Chilton J and Stenlake JB, Dissociation constants of some compounds related to lysergic acid Beta-dimethylaminopropionic acid, chhydroarecaidine, ecgonine and their derivatives, /. Pharm. Pharmacol., 7,1004-1011 (1955). Cited in Perrin 2862 ref. C27. NB The potentiometric study used pH measurements with a glass electrode and junction potentials. See Aconitine for details of the spectrophotometric study. 

Potentiometric H2O t = lS 2 c = 0.04 Holmes F and Crimmin WRC, The stabilities of metal chelate compounds formed by some heterocyclic acids. I. Studies in aqueous solution,/. Chem. Soc., 1175-1180 (1955). 

Michaelis, L, Schubert MP and Smythe CV, Potentiometric study of the flavins, /. Biol. Chetn. 116,587-607 (1936). Cited in Perrin Bases no. 3335 ref. M44. NB Study used spectrqphotometric measurements in strcmgly acid solutions (pKai) and a... 

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