Department of Chemistry, Rajendra College, Chapra-841 301, Bihar, India Department of Chemistry, Jagdam College, Chapra-841 301, Bihar, India Manuscript received 27 April 2009, accepted 20 August 2009 Acid-base reactions In apolar aprotic media provide a sufficiently close measure of intrinsic acid/base strengths. A study on reaction equilibria between o- and m-methyl benzoic: (toluic) acids with the carbinol base of crystal violet in five apolar aprotic solvents of similar Kirkwood polarity function (\(\in\) - 1)/(2\(\in\)+ 1) and significantly different Dimroth Reichardt's ET (30) and Kamlet-Taft's polarity-polarisability 𝝅* parameter Indicates strongly the overall non-specific solvent effects are contributed by both electrostatic and dispersion interactions, the latter having a more dominant role therein.