Abstract. The results showed a sharp increase in the conductivity with increasing electrolyte concentration. Also, the conductivity of electrolyte increases with increase in temperature whereas the conductivity of electrolyte decreases with increase in the amount of methanol.

The interaction of an anionic dye (Methyl Orange) with cationic surfactant (Cetyltrimethylammonium Bromide, CTAB) in the series of solvent containing variable compositions of methanol-water mixture (10%, 20%, 30% and 40%) was studied at room temperature (31±2 o C). Conductivity measurements were done for the investigation of interaction of dyes. The specific conductance of 6.58x10-5 M to 59.22x10 M surfactant (CTAB) and these surfactants with 1.008x10 -3 M dye (MO) mixtures were noted at room temperature. A theoretical model was used to calculate conductance ratio from the data of measured specific conductance values.Values of conductance ratio of CTAB-MO mixtures were found to be all less than 1 which indicated that CTAB-MO dye -surfactant mixture exert significant influence on the degree of interaction.

No abstract