Diffusion of mannitol and thiourea at trace concentrations in aqueous solutions at 25°

Abstract

Intradiffusion coefficients have been measured for labelled mannitol in aqueous mannitol solutions to 0.7782 M and for labelled thiourea in thiourea solutions to 1.379 M. Use of mutual diffusion and activity coefficient data for the mannitol system has allowed calculation of isotopic friction coeficients R_ik for this system. For three of the four non-electrolyte molecules for which data are now available, the limiting R_ik values appear to be a linear function of the apparent molar volume.