Abstract
The factors controlling the concentration dependence of the electrolyte conductance in supercritical water (SCW) have been analyzed to establish a reliable method to obtain the limiting conductance Λo and the association constant KA from a set of conductance data in a moderate concentration range. The conductance measurements should be carried out in such a moderate concentration range because of experimental difficulties. The equations of conductance (EOC) used here are the Fuoss−Chen−Justice (FCJ), the Fuoss−Hsia−Fernandez−Prini, and the Shedlovsky equations. We have shown that two-parameter (Λo and KA) fitting methods provide more reliable results than three-parameter methods in a moderate concentration range, and that the three equations give similar fitting results. We have examined what contributions are made by individual terms in the FCJ equation at a moderate concentration in SCW and found that the higher-order terms in concentration nearly cancel each other despite the large individual contribut...
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