Thermodynamics of ionization of o-fluoro and o-chloro benzoic acids in water–ethanol mixtures at 298.15K

1998 ◽  
Vol 317 (2) ◽  
pp. 201-203 ◽  
Author(s):  
Yan-Qing Nan ◽  
Qing-Sen Yu ◽  
Rui-Sen Lin
Keyword(s):  
Benzoic Acids ◽  
Thermodynamics Of Ionization

scholarly journals Thermodynamics of Ionization of Benzoic Acid and Some Substituted Benzoic Acids in 1,4-Dioxane--Water Mixtures.

1992 ◽  
Vol 46 ◽  
pp. 399-402 ◽  
Author(s):  
Dattatraya Vyankatesh Jahagirdar ◽  
Harri Lönnberg ◽  
S. Grundvig ◽  
Yngve Stenstrøm ◽  
Agha Zul-Quarnain Khan ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Benzoic Acids ◽  
Substituted Benzoic Acids ◽  
Thermodynamics Of Ionization

Thermodynamics of Ionization of Benzoic Acid and Substituted Benzoic Acids in Relation to the Hammett Equation

1974 ◽  
Vol 52 (16) ◽  
pp. 2906-2911 ◽  
Author(s):  
Takeki Matsui ◽  
Hon Chung Ko ◽  
Loren G. Hepler
Keyword(s):  
Benzoic Acid ◽  
Ionization Constants ◽  
Benzoic Acids ◽  
Hammett Equation ◽  
Good Linear ◽  
Calorimetric Measurements ◽  
Linear Relationships ◽  
Best Value ◽  
Substituted Benzoic Acids ◽  
Thermodynamics Of Ionization

We have made both ampoule and titration calorimetric measurements leading to ΔH0 of ionization of aqueous benzoic acid at 298 K, and have considered our results in relation to those from several earlier investigations in an effort to select the "best" value for this important quantity. We have also made calorimetric measurements leading to ΔH0 values for ionization of several substituted benzoic acids, and have selected "best" ΔH0 values for 15 meta- and para-substituted benzoic acids. It is found that there are good linear relationships between ΔG0, ΔH0, and ΔS0 values for most of these substituted benzoic acids. It is also found that the Hammett equation accounts well for ionization constants over the temperature range 278–318 K for all of these acids and accounts very well for ionization constants of those acids with positive σ substituent parameters.

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