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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