Critical Micelle Concentration of Surfactant Using Hadkar Factor

Abstract:

Critical micelle concentration is an important characteristic property of a surfactant and various methods such as osmotic pressure, surface tension, interfacial tension, UV-Visible spectrophotometry have been reported to determine it. The drop weight method was used to determine the Hadkar factor H₁ for organic liquid lighter than water and Hadkar factor H₂ was used for organic liquid heavier than water. The plot of H₁ or H₂ vs concentration of the aqueous surfactant solution was used to determine the critical micelle concentration of the surfactant. Interfacial tension between the aqueous surfactant solution and the organic liquid was also determined using Hadkar factors H₁ and H₂.

Key words: Drop weight method, Hadkar factors, Interfacial tension, critical micelle concentration, surfactant,
pipette.