Abstract
A conductimetric technique is used to determine the diffusion coefficients of electrolytes in porous media. An initial concentration gradient is formed by introducing electrolyte into the lower end of a short column of porous material. The rate at which diffusion spreads the electrolyte along the column is followed by measuring changes in electrical conductance at levels 16 and l56 of the column heights, as in Harned restricted diffusion cells. Binary interdiffusion coefficients are reported for aqueous HCl, HNO3 and H2SO4 at 25°C in columns of Amberlite IR-120(H) polystyrenesulfonic acid cation exchange resin beads. Supplementary data for diffusion of aqueous HCl in columns of glass beads and for aqueous HNO3 in bulk solution are also reported.
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