Temperature Behaviour on Solubility and Equilibrium Dissociation Constant of Benzoic Acid in NaCl Media against NaOH Solution : A Titrimetric Study

Abstract

Titrimetric based study of two salts such as benzoic acid in sodium chloride (NaCl) media against sodium hydroxide (NaOH) basic solution have been reported here. Where, the aqueous solubility and equilibrium dissociation constant (Kc) of benzoic acid salt is showing at 25˚C temperature in respect of thermodynamic dissociation constant (Ka). At this temperature the benzoic acid's solubility into water and its dissociation value in six range of 0.00, 0.05, 0.10, 0.30, 0.40 and 0.50 M as for each different ionic strength (concentration) of NaCl salt, which is analyzed by titrimetrically against to 0.05 M of NaOH solution. The pH of each solutions are measured well by using of pH-meter. Here, observation reveals that, the value of pH for benzoic acid into water at applying temperature is may inversely related with strength of NaCl. In graphically, the value of ionic strength (I) of that benzoic acid is plotted against with Kc (dissociation constant) of acid in water at specific 25˚C temperature. The value of Kc of benzoic acid for given each six concentration of NaCl is being -4.169, -4.045, -3.993, -3.885, -3.848 and -3.788, respectively.