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K. N. Mehrotra ¹, S. K. Upadhyaya ¹

Affiliations
1 Department of Chemistry, Agra University, Agra-282004, IN

Abstract

The critical micelle concentration, degree of dissociation and dissociation constant of calcium caprylate in mixtures of varying composition of chlorofoME-propylene glycol were determined using conductometric measurements. The results show that the soap behaves as a weak electrolyte in these solutions below the CMC. The value of the specific conductance increases by the addition of dye to these soap solutions.

Keywords

Calcium Soap, Conductometry, Mixed Solvent.

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Anushri Gupta ¹, S. K. Upadhyaya ¹

Affiliations
1 Department of Chemistry, S.S.L. Jain P.G. College, Vidisha (M.P.), IN

Abstract

Ultrasonic velocity of cerium and thorium laurate in benzene-methanol mixture was used to determine the CMC, soap solvent interaction and various acoustic parameters. The results show that ultrasonic velocity, specific acoustic impedance, molar sound velocity increases with increasing soap concentration and decreases with the increase in temperature while intermolecular free length, adiabatic compressibility, apparent molar volume, apparent molar compressibility and solvation number decreases with increase in soap concentration. The internal pressure of the solutions decreases with increase in soap concentration at all temperatures. The results of ultrasonic measurements have been interpreted in the light of well known equations.

Keywords

Ultrasonic Velocity, CMC, Compressibility Behavior, Internal Pressure, Acoustic Parameters, Soap-Solvent Interactions.

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Kamal Kishore ¹, S. K. Upadhyaya ¹

Affiliations
1 Department of Chemistry, S.S.L. Jain P.G. College, Vidisha-464001, (M.P), IN

Abstract

The ultrasonic measurements of solutions of terbium soaps (laurate and myristate) in a mixture of 60/40 benzene-methanol (v/v) have been used to evaluate critical micellar concentration (CMC), ultrasonic velocity and various acoustic parameters at 40°C. The results confirm that there is a significant interaction between the soap and solvent molecules. The values of critical micellar concentration (CMC) for terbium laurate and myristate are in agreement with those obtained from other physical parameters. The soap molecules do not aggregate appreciably in dilute soap solution below the critical micellar concentration.

Keywords

Ultrasonic Velocity, Terbium Soaps, Acoustic Parameters, CMC.

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