Dissociation quotients of succinic acid in aqueous sodium chloride media to 225{degrees}C

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Journal of Solution Chemistry

DOI:https://doi.org/10.1007/BF00973050· OSTI ID:35538

Kettler, R M ^[1]; Palmer, D A; Wesolowski, D J ^[2]

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1. Univ. of Nebraska, Lincoln, NE (United States)
2. Oak Ridge National Lab., TN (United States)

The first and second molal dissociation quotients of succinic acid were measured potentiometrically with a hydrogen-electrode, concentration cell. These measurements were carried out from 0 to 225{degrees}C over 25{degrees} intervals at five ionic strengths ranging from 0.1 to 5.0 molal (NaCl). The dissociation quotients from this and two other studies were combined and treated with empirical equations to yield the following thermodynamic quantities for the first acid dissociation equilibrium at 25{degrees}C: logK{sub 1a} = -4.210{+-}0.003; {Delta}H{sub 1a}{sup 0} = 2.9{+-} 0.2 kJ-mol{sup {minus}1}; {Delta}S{sub 1a}{sup 0} = -71{+-}1 J-mol{sup {minus}1}-K{sup {minus}1}; and {Delta}C{sub p1a}{sup 0} = -98{+-}3 J-mol{sup {minus}1}-K{sup {minus}1}; and for the second acid dissociation equilibrium at 25{degrees}C: logK{sub 2a} = -5.638{+-}0.001; {Delta}H{sub 2a}{sup 0} = -0.5{+-}0.1 kJ-mol{sup {minus}1}; {Delta}S{sub 2a}{sup 0} = -109.7{+-}0.4 J-mol{sup {minus}1}-K{sup {minus}1}; and {Delta}C{sub p2a}{sup 0} = -215{+-}8 J-mol{sup {minus}1}-K{sup {minus}1}.

• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 35538
• Journal Information: Journal of Solution Chemistry, Journal Name: Journal of Solution Chemistry Journal Issue: 1 Vol. 24; ISSN 0095-9782; ISSN JSLCAG
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
AQUEOUS SOLUTIONS
DISSOCIATION
EQUILIBRIUM
POTENTIOMETRY
SODIUM CHLORIDES
SUCCINIC ACID
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
THERMODYNAMIC PROPERTIES