Using a laser monitoring observation technique, the solubilities of 4-methy
lbenzoic acid in N-methyl-2-pyrrolidone, N,N-dimethylformamide, N,N-dimethy
lacetamide, trichloromethane, acetic acid, and water were measured by a syn
thetic method at temperatures ranging from 288 K to 370 K at atmospheric pr
essure. A solubility equation was proposed and verified by experimental res
ults. Differential scanning calorimetry experiments were also performed and
discussed.