Probing solute–solvent interactions of some bio-active solutes in aqueous barium nitrate solution on the basis of physicochemical contrivances

• l-Valine is more associated in aqueous Ba(NO3)2 solution than the other amino acids.
• Solute–solvent interaction predominates over the solute–solute interactions in all the studied solutions.
• The overall order of solute–solvent interaction is found to be glycine < l-alanine < l-valine.

Apparent molar volume (ϕV), molar refraction (R), viscosity B-coefficient and adiabatic compressibility (ϕK) of some bio-active solutes such as glycine, l-alanine, and l-valine have been measured in 0.01, 0.03, 0.05 mol dm−3 aqueous barium nitrate solutions at 298.15 K. Masson equation was employed for the limiting apparent molar volumes (ϕV0), experimental slopes (SV*) to interprete the solute–solvent and solute–solute interactions respectively. Molar refractions (R) have been calculated using the Lorentz–Lorenz equation. Jones–Dole equation was used to derive parameters A and B   to interprete the interactions. Limiting apparent molar adiabatic compressibilities (ϕK0) at infinite dilution were examined from the sound speed values.

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