CMC values of ionic surfactants SDS and DTAB, were determined conductometrically in water, water + propanol and water + fructose systems at different concentrations of propanol and fructose at 298.15, 308.15 and 318.15 K. From CMC values micellisation constant (KM), Setchenov constant (KS N) and interaction parameters ‘P’ and ‘q’ were calculated. KM values are positive for 2-propanol + water system and negative for fructose + water system. KS N values in 2-propanol system are more as compared to fructose system. It suggests that nature of polar group of additive plays major role in solubilisation process. The high ‘P’ and ‘q’ values in presence of 2-propanol suggests that 2-propanol penetrates in the interior of micelle, while larger ‘P’ and ‘q’ values for DTAB in presence of fructose are indicative of adsorption of fructose on the micellar surface.
