Ion-solvent interactions - studies on the solvation of electrolytes in mixed solvents

✍ Scribed by S.K. Maity; A.K. Chattopadhyay; S.C. Lahiri

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 359 KB
• Volume: 25
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(80)87166-0

✦ Synopsis

Abshact-In order to throw light on ion-solvent interactions, the salvation numbers of electrolytes in different mixed solvents (methanol + water and ethanol + water mixtures) have been determined using ultrasonic interferometer. The anomalies in the salvation number of cations (in aqueous solutions) like K+, Na+ and H + are presented. The changes in the salvation numbers of electrolytes with increasing quantities of alcohol indicates some interesting features and are explained on the basis of: (i) decrease in the solvent molecules. (ii) structural re-arrangement. (iii) preferential salvation of cations and anions. (iv) Approximadons in the determination of salvation numbers. The role of the solvents could hardly be explained in absence of a complete knowledge of the nature of solvation of electrolytes and particularly of iqns. The subject has attracted considerable attention and the solvation number has been determined using different well-known techniques[lL4].

In order to throw light on the ion-solvent interactions, we tried to determine the salvation numbers of different known electrolytes like HCl, NaCl and KC1 in water, methanol + water and ethanol + water mixtures by the compressibility method using ultrasonic interferometer. The results are presented in this communication.