Abstract
The apparent acid dissociation constant (Kc) of benzoic acid in water has been determined ti-trimetrically under ionic strength values between 0.00 and 0.50 mol·L﹣1 at a range of temperatures between 16°C and 41°C. The thermodynamic dissociation constant (as pKa) of benzoic acid was determined as 4.176 at 25°C. No regular correlation between pKa of benzoic acid and the temperature in the range was used. The values of pKa are inversely proportional to temperatures between 16°C and 30°C. In this range of temperature, the values of thermodynamic quantities () for the dissociation process of benzoic acid in water were calculated by using Van’t Hoff plot. For this case the dissociation was not favoured through entropy and enthalpy changes. The values of pKa are directly proportional to temperatures between 30°C and 41°C.
Highlights
Equilibrium studies concerning the solubility and the dissociation process of many well-known weak acids in aqueous solutions have been reported over the years by following many physical and analytical methods
Benzoic acid dissociates partially in water to produce benzoate anion and hydronium cation with an apparent dissociation constant that depends on many factors
The influence of the ionic strength on the solubility and the apparent dissociation constant (Kc) of benzoic acid at 25 ̊C was examined at six different ionic strengths in the range of 0.0013 - 0.50 M by adding NaCl
Summary
Equilibrium studies concerning the solubility and the dissociation process of many well-known weak acids in aqueous solutions have been reported over the years by following many physical and analytical methods. Benzoic acid dissociates partially in water to produce benzoate anion and hydronium cation with an apparent dissociation constant that depends on many factors It is well-known that the temperature and ionic. The apparent dissociation constants (Kc) of benzoic acid in aqueous solutions have been determined titrimetrically with different values of ionic strengths at a small range of temperatures. The thermodynamic parameters of the dissociation process of benzoic acid in water have been reported at standard condition The absence of such information on benzoic acid in the literature following this method motivated us to carry out this study.
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