Using a laser monitoring technique, the solubilities of 1,1'-(butane-1,4-diyl)-bis(3-methylpyridinium) dihexafluorophosphate in water, acetylacetone, acetophenone, cyclohexanone, 2-butanone, and acetone + water were determined at temperatures from (288.15 to 333.15) K at atmospheric pressure. The experimental data were correlated with the modified Apelblat equation and the lambda h model.