Investigation on Molecular Interactions of Multicharged Electrolytes Potassium Pyrophosphate and Potassium Dichromate in Aqueous D-Sorbitol Media at 298.15K by Densiometric and Acoustic Methods

Abstract

Two multicharged electrolytes, potassium pyrophosphate, and potassium dichromate have been taken for densiometric and acoustic studies at 298.15K. Solvents for these electrolytes are 5, 10, and 15 weight % of D-sorbitol in water. From the density d and ultrasonic velocity U compressibility values, K_s,K_(s,ф),〖 K〗_T and W for the solutions, as well as for the solvents, are derived. Other acoustic variables like molar free volume V_f, internal pressure π_i, relative association R_A, solvation number S_n^(0 ), acoustic impedance Z are also calculated. Interpretations of these parameters in the light of molecular interactions are made. It is found that the compressibility of the solutions and the solvent decrease with a concentration of electrolyte and amount of d-sorbitol as a result of the structure breaking property of alkali metal ions and electrostriction of the solvation shells. The presence of strong ion-solvent interaction in the solution is supported by the values of the derived parameters.