Abstract
The Pitzer approach has been applied to the evaluation of dissociation constants of ammonium ion in lithium perchlorate and lithium chloride-sodium chloride mixed solutions at 25°C. The calculated values showed good agreement with the observed values, provided all the higher-order interaction terms (θ's and Ψ's) concerned were introduced. The unknown Ψ(NH4LiClO4) value was determined from the isopiestic measurements of NH4ClO4−LiClO4 mixed solutions. Parameters in the Pitzer formalism for ammonia-ion interactions involved in LiCl and NaCl media were determined by use of the activity coefficients of ammonia measured in LiCl−NaCl mixed solutions by a transpiration method.
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