Evaluation of dissociation constants of ammonium ion in aqueous lithium perchlorate and lithium chloride-sodium chloride mixed solutions |
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Authors: | Masunobu Maeda Yoshiaki Kinjo Osamu Hisada Kaname Ito |
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Institution: | (1) Department of Applied Chemistry, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, 466 Nagoya, Japan;(2) Chemical Laboratory, College of Education, The University of the Ryukyus, 903-01 Okinawa, Japan |
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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 ('s and 's) concerned were introduced. The unknown (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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Keywords: | Activity coefficient Pitzer's equations dissociation constants of ammonium ion higher-order terms |
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