The accurate measurements of surface tension of sodium dodecyl sulphate (SDS) in distilled water and in presence of 0.01M Na 2 SO 4 and 0.01M ZnSO 4 at room temperature were reported by drop weight method using a stalagmometer. The critical micelle concentration (cmc) of sodium dodecyl sulphate (SDS) in distilled water was obtained higher than in presence of Na 2 SO 4 and ZnSO 4 . The decrease of cmc of sodium dodecyl sulphate in the presence of salts has been discussed.
Conductance measurement of sodium dodecylsulfate in the presence and in the absence of Na2SO4 and ZnSO4 in aqueous media was done. The results showed sharp increase in conductance with increase in concentration of sodium dodecylsulfate. Also, the conductance increases with addition of salts. The conductance of sodium dodecylsulfate is found more in the presence of Na2SO4 than ZnSO4 in aqueous media. In the presence of salts, the critical micelle concentration (cmc) value decreases which are explained on the basis of the nature and ion size of the added ion. The graph of conductance versus concentration is used in determining the critical micelle concentration (cmc).Scientific World, Vol. 12, No. 12, September 2014, page 41-43
The precise measurements of density of sodium dodecyl sulfate (SDS) in distilled water and in presence of 0.01M Na2SO4 and 0.01M ZnSO4 atroom temperature were measured by Ostwald-Sprengel type pycnometer. The density of SDS in distilled water was found lower than the density of SDS in Na2SO4 and ZnSO4 solutions whereas the density of SDS in the presence of ZnSO4 is higher than the density of SDS in the presence of Na2SO4. The partial molar volume of SDS in distilled water was obtained higher than in presence of Na2SO4 and ZnSO4 solutions.BIBECHANA 16 (2019) 131-136
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