Journal of Solution Chemistry

, Volume 24, Issue 6, pp 523–535 | Cite as

Interdiffusion without a common ion in aqueous NaCl−MgSO4 and LiCl−NaOH mixed electrolytes

  • Ling Hao
  • Derek G. Leaist


When a solution of electrolyte MX interdiffuses with a solution of electrolyte NY, the transport of four different ions (M, X, N, and Y) is constrained only by electroneutrality. Because three degrees of freedom remain, the interdiffusion of two electrolytes without a common ion can produce an independent flow of a third electrolyte. This behavior is demonstrated by using Taylor dispersion to measure interdiffusion coefficients, including cross-coefficients, for NaCl−MgSO4-water and LiCl−NaOH-water mixed electrolytes at 25°C. The measurements are made for electrolyte mole ratios of 0∶1, 1∶3, 1∶1, 3∶1, and 1∶0 at a total electrolyte concentration of 0.100 mol L−1. The results are used to calculate concentration profiles across NaCl(aq)/MgSO4(aq) and LiCl(aq)/NaOH(aq) liquid junctions. The interdiffusion of NaCl and MgSO4 produces relatively small flows of Na2SO4. As a result of large differences in ionic mobilities for the aqueous LiCl−NaOH system, substantial flows of NaCl develop during the interdiffusion of LiCl and NaOH.

Key Words

Diffusion multicomponent diffusion coefficients liquid junctions mixed electrolytes Taylor dispersion 


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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • Ling Hao
    • 1
  • Derek G. Leaist
    • 1
  1. 1.Department of ChemistryUniversity of Western OntarioLondonCanada

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