scholarly journals Dissociation constants and pH-titration curves at constant ionic strength from electrometric titrations in cells without liquid junction: titrations of formic acid and acetic acid

1943 ◽  
Vol 30 (5) ◽  
pp. 347 ◽  
Author(s):  
R.G. Bates ◽  
G.L. Siegel ◽  
S.F. Acree
Keyword(s):  
Acetic Acid ◽  
Ionic Strength ◽  
Formic Acid ◽  
Dissociation Constants ◽  
Constant Ionic Strength ◽  
Liquid Junction ◽  
Ph Titration ◽  
Titration Curves ◽  
In Cells

The multiple dissociation constants of glutathione disulfide: interpreting experimental pH-titration curves with ab initio MD simulations

2019 ◽  
Vol 21 (18) ◽  
pp. 9212-9217 ◽  
Author(s):  
Vaishali Arunachalam ◽  
Anil Kumar Tummanapelli ◽  
Sukumaran Vasudevan
Keyword(s):  
Complex Systems ◽  
Ab Initio ◽  
Dissociation Constants ◽  
Md Simulations ◽  
Glutathione Disulfide ◽  
Ph Titration ◽  
Titration Curves ◽  
Ab Initio Md

Dissociation constants calculated from ab initio MD simulations can aid the interpretation of the pH-titration curves of complex systems.

Dissociation Constants of Ethane-1-hydroxy-1,1-diphosphonate [EHDP] and Dichloromethylene-diphosphonate [Cl2MDP] for H+, Ca2+, Mg2+ and Zn2+

1976 ◽  
Vol 31 (11-12) ◽  
pp. 661-663 ◽  
Author(s):  
Peter Dietsch ◽  
Theodor Günther ◽  
Manfred Röhnelt
Keyword(s):  
Dissociation Constants ◽  
Ph Titration ◽  
Methylene Diphosphonate ◽  
Titration Curves ◽  
Dichloromethylene Diphosphonate

Abstract Diphosphonates, Dissociation Constants The dissociation constants of ethane-l-hydroxy-1,1-disphosphonate [EHDP] and dichloro-methylene-diphosphonate [Cl2MDP] for H+, Ca2+, Mg2+ and Zn2+ have been determined from pH-titration curves. EHDP forms more stable chelates with Ca2+, Mg2+ and Zn2+ than Cl2MDP. Cl2MDP is a stronger acid than EHDP.

scholarly journals Surface and Charge Characteristics of the Oxide/Solution Interface Towards Chromium(VI) Sorption

1994 ◽  
Vol 11 (3) ◽  
pp. 145-154 ◽  
Author(s):  
M.M. Bhutani ◽  
Ramesh Kumari
Keyword(s):  
Zirconium Oxide ◽  
Dissociation Constants ◽  
Sorption Process ◽  
Point Of Zero Charge ◽  
Experimental Conditions ◽  
Ph Titration ◽  
Ph Values ◽  
Chromium Vi ◽  
Titration Curves ◽  
Solution Interface

The interfacial properties of zirconium oxide, titanium oxide and bismuth oxide have been studied under various experimental conditions. The oxides were characterized by means of their pH titration curves, intrinsic dissociation constants [pKai*(intr.), i = 1, 2) and point of zero charge (pHpzc) in varying concentrations of KNO3 and Na2CrO4 solutions. The pHpzc values of all the oxide samples tended to shift to higher pH values in the presence of Na2CrO4 solution and remain the same in the presence of KNO3 solution. A mechanism for the sorption process is proposed proceeding through an exchange with surface OH– or H2O groups and is interpreted as a case of specific adsorption.

scholarly journals Electrometric titration of amino-acids in aqueous-alcoholic solution

1934 ◽  
Vol 145 (854) ◽  
pp. 361-361
Keyword(s):  
Amino Acids ◽  
Dissociation Constants ◽  
Strong Support ◽  
Alcoholic Solution ◽  
Theoretical Treatment ◽  
Aqueous Alcohol ◽  
Liquid Junction ◽  
Titration Curves ◽  
Electrometric Titration ◽  
Volumetric Methods

(1) It has been shown that the acid-base theory of Brönsted can be made the basis of a single theoretical treatment of the constitution of ampholytes. (2) A technique has been developed by which aqueous-alcoholic solutions of amino-acids may be titrated electrometrically against a standard aqueous calomel electrode with practically no interference from liquid junction or phase boundary potentials. (3) Although the system used cannot be thermodynamically defined it us capable of showing clearly the variation in the behaviour of acidic and basic groups in relation to the dielectric constant of the solvent. (4) The results obtained by this method give strong support to the zwitterionic theory of the constitution of amino-acids. (5) The importance of electronmagnetic titrations in aqueous alcohol for volumetric purposes and for the interpretation of dissociation constants has been pointed out and the basis of the existing volumetric methods of estimation of amino-acids has been discussed in tbs light of the facts revealed by tbe titration curves.

Adsorption of chlorate and bromate ions on mercury electrodes from constant ionic strength solutions

1988 ◽  
Vol 85 ◽  
pp. 523-527
Author(s):  
M.M. Zuleika ◽  
Palhares SILVA ◽  
Ernesto Rafael GONZALEZ ◽  
Luis Alberto AVACA ◽  
Artur de Jesus MOTHEO
Keyword(s):  
Ionic Strength ◽  
Constant Ionic Strength ◽  
Mercury Electrodes

Extraction of hafnium by means of some substituted 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-ones

1981 ◽  
Vol 46 (8) ◽  
pp. 1901-1905 ◽  
Author(s):  
Oldřich Navrátil ◽  
Jiří Smola
Keyword(s):  
Ionic Strength ◽  
Aqueous Phase ◽  
Dissociation Constants ◽  
Parent Substance ◽  
Benzoyl Group ◽  
Extraction Constants ◽  
Extraction Parameters ◽  
Substituted 1

Distribution between aqueous phase and benzene or chloroform was studied for 1-phenyl-3-methyl-4-benzoylpyrazol-5-ones with 2-chloro, 4-methoxy, 3-nitro, and 4-nitro substitution in the benzoyl group (ionic strength of the aqueous phase 0.1) and for hafnium in their presence (ionic strength 2.0). The distribution and dissociation constants of the reagents and the extraction constants of their hafnium complexes were determined. Hafnium was found to be extracted as the HfA4 species. The extraction parameters of the derivatives in question do not differ substantially from those of the parent substance.

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