Aqueous solubility of ibuprofen as a function
of the molar concentration of sodium benzoate.
Out of them sodium benzoate shows significant
enhancement in solubility, so sodium benzoate was
used for extensive study. Fig. 3 shows increased
aqueous solubility of ibuprofen by sodium benzoate.
The solubilities at 0.5M, 1M, 1.5M and 2.0M sodium
benzoate were 2.273 mg/ml, 8.745 mg/ml, 16.084
mg/ml, and 30.047 mg/ml, respectively. Solubility
increases with further increase in concentration of
sodium benzoate.