Determination of limiting molar conductivities of weak organic acids in aqueous solutions

1991 ◽  
Vol 56 (6) ◽  
pp. 1184-1192 ◽  
Author(s):  
Begoña García ◽  
Inmaculada Domingo ◽  
Pedro L. Domingo ◽  
José M. Leal
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Dissociation Constants ◽  
Divalent Ions ◽  
Free Ions ◽  
Conductance Data ◽  
Limiting Conductances ◽  
Limiting Molar Conductivities ◽  
Degrees Of Dissociation

Conductance, potentiometric, and spectrophotometric measurements have been made at 25°C of aqueous solution containing sulfanilic, hippuric, mandelic, and 3,5-dinitrosalicylic acids at different concentrations. Conductance data were analyzed using the methods of Fuoss-Kraus, Kraus-Parker, and Shedlovsky for conductivity of the free ions. Using the calculated limiting conductances, activity coefficients, and degrees of dissociation, the dissociation constants of the weak acids were determined. From plots Δ vs c1/2, reliable values for Δ0 were estimated, using a computer program, and by means of an iterative method the proper value of Δ0 was determined, independently of that initially introduced. Values of pK were also obtained from potentiometric and spectrophotometric measurements. Evidence for the existence of univalent and divalent ions in aqueous solutions of 3,5-dinitrosalicylic acid was obtained spectrophotometrically, this fact justifying the poorer results provided by conductance measurements.

scholarly journals A chemical probe technique for the determination of reactive halogen species in aqueous solution: Part 2 – chloride solutions and mixed bromide/chloride solutions

2006 ◽  
Vol 6 (1) ◽  
pp. 941-979 ◽  
Author(s):  
C. Anastasio ◽  
B. M. Matthew
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Method Development ◽  
Companion Paper ◽  
Chemical Probe ◽  
Chloride Solutions ◽  
Reactive Halogen Species ◽  
A New Technique ◽  
Halogen Species

Abstract. Although reactive halogen species (X*=X●, ●X2−, X2 and HOX, where X=Br, Cl, or I) are important environmental oxidants, relatively little is known about their kinetics in condensed phases such as seawater and sea-salt particles. Here we describe a new technique to determine reactive chlorine and bromine species in aqueous solutions by using allyl alcohol (CH2=CHCH2OH) as a chemical probe. This probe is combined with competition kinetics in order to determine steady state concentrations of X*(aq). In some cases the technique also can be used to determine the rates of formation and lifetimes of X* in aqueous solution. In a companion paper we reported the results of our method development for aqueous solutions containing only bromide (Br−). In this paper, we discuss method development for solutions containing chloride (Cl−) alone, and for solutions containing both bromide and chloride.

Determination of the Dissociation Constants of Urocanic Acid Isomers in Aqueous Solutions

2007 ◽  
Vol 138 (10) ◽  
pp. 951-965 ◽  
Author(s):  
Pekka Juusola ◽  
Pentti Minkkinen ◽  
Lasse Leino ◽  
Jarmo K. Laihia
Keyword(s):  
Aqueous Solutions ◽  
Dissociation Constants ◽  
Urocanic Acid

A novel sensing membrane for the determination of ferric ions in aqueous solutions

2015 ◽  
Vol 7 (7) ◽  
pp. 3089-3095
Author(s):  
Wenjuan Fu ◽  
Xiangfeng Guo ◽  
Lihua Jia ◽  
Ying Ding
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Fluorescence Intensity ◽  
Fast Response ◽  
Ferric Ions ◽  
Sensing Membrane

A new sensing membrane is proposed for the determination of Fe3+ over other common metal ions in an aqueous solution based on the quenching of the fluorescence intensity of the membrane by Fe3+. The fluorescence intensity of the membrane showed distinct changes towards Fe3+ with fast response, satisfactory stability and excellent sensitivity.

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