Volume : V, Issue : IX, September - 2016

A STUDY ON pH AND SOLUBILITY OF AQUEOUS COPPER, ZINC, SILVER AND CADMIUM DODECYLSULPHATES

Dr. Tarun

Abstract :

 The present study deals with pH and solubility of aqueous solutions of copper, zinc, silver and cadmium dodecylsulphates. pH of the aqueous solutions was measured at 40 ? 0.05°C, whereas solubility of these solutions studied at 30°–50°C. pH measurement was used to evaluate hydrolysis constant, KH , ionization constant of base, Kb and degree of hydrolysis, X. The results were indicative of the fact that these compounds hydrolyze considerably at the lower concentrations (pre–micellar region). The hydrolysis was however subdued as the concentration of compounds increases and becomes almost negligible in the vicinity of critical micelle concentration, cmc. The solubility of these compounds was found to increase with increasing temperature and varies as Cu(II)DS > Zn(II)DS > Cd(II)DS > Ag(I)DS. The plots of logarithm of solubility vs. inverse of absolute temperature (log S vs. 1/T) show an intersection nearly at 40°C, the temperature indicating a common Krafft point hinting the onset of micellization. The apparent heat of solution, ?Hsol. and entropy of solution, ?Ssol. were also computed.

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Article: Download PDF   DOI : 10.36106/ijsr  

Cite This Article:

Dr. Tarun A STUDY ON pH AND SOLUBILITY OF AQUEOUS COPPER, ZINC, SILVER AND CADMIUM DODECYLSULPHATES International Journal of Scientific Research,Volume : 5 | Issue : 9 |September 2016

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