Multicomponent diffusion of double salts. Sodium hydrogen sulphate in aqueous solution
- 1 January 1986
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 82 (1) , 247-253
- https://doi.org/10.1039/f19868200247
Abstract
Diffusion coefficients for the double salt sodium hydrogen sulphate in aqueous solution have been determined at 25 °C from infinite dilution to 2 mol dm–3 using limiting ionic conductances, the Harned restricted-diffusion method and Gouy optical data reported previously for aqueous sodium sulphate–sulphuric acid mixtures. Because the total flux of hydrogen ions exceeds the flux of less-mobile sodium co-ions, diffusion of aqueous NaHSO4 forms a ternary mixture of NaHSO4–H2SO4 in front of the diffusion boundary while a ternary mixture of NaHSO4–Na2SO4 remains behind. Diffusion in aqueous solutions of NaHSO4 can be described by a coupled flow of H2SO4 in addition to the flow of NaHSO4. At concentrations below 0.1 mol dm–3 the coupled flow of H2SO4 exceeds the flow of NaHSO4. Expressions are developed to predict ternary transport coefficients for diffusion of double salts.This publication has 0 references indexed in Scilit: