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

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Title:Determination of limiting molar conductivities of weak organic acids in aqueous solutions
Creators:
García, Begoña
Domingo, Inmaculada
Domingo, Pedro L.
Leal, José M.
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 56, 6, pp. 1184-1192

Abstract

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 <i>c</i><sup>1/2</sup>, reliable values for Δ<sub>0</sub> were estimated, using a computer program, and by means of an iterative method the proper value of Δ<sub>0</sub> was determined, independently of that initially introduced. Values of p<i>K</i> 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.

Title:Determination of limiting molar conductivities of weak organic acids in aqueous solutions
Creators:
García, Begoña
Domingo, Inmaculada
Domingo, Pedro L.
Leal, José M.
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:56
Number:6
Page Range:pp. 1184-1192
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19911184UNSPECIFIED
ID Code:5038
Item Type:Article
Deposited On:22 Feb 2010 11:29
Last Modified:22 Feb 2010 10:29

Citation

García, Begoña; Domingo, Inmaculada; Domingo, Pedro L.; Leal, José M. (1991) Determination of limiting molar conductivities of weak organic acids in aqueous solutions. Collection of Czechoslovak Chemical Communications, 56 (6). pp. 1184-1192. ISSN 0010-0765

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