Ultrasonic Studies of 4-Aminobutyric Acid in Aqueous Salbutamol Sulphate Solutions at Different Temperatures

Abstract

Ultrasonic speeds of 4-aminobutyric acid in 0.0041, 0.0125 and 0.0207 mol·kg −1 aqueous salbutamol sulphate (SBS) solutions are measured at 308.15, 313.15 and 318.15 K. Isentropic compressibility K S, change in isentropic compressibility Δ K S, relative change in isentropic compressibility (Δ K S/ K 0 S), apparent molal compressibility K ø, limiting apparent molal compressibility K 0 ø, transfer limiting apparent molal compressibility δ K 0 ø, hydration number n H, pair and triplet interaction parameters K AS, K ASS are estimated. The above parameters are used to interpret the solute-solute and solute-solvent interactions of 4-aminobutyric acid in the aqueous salbutamol sulphate solutions.