MECHANISM OF ION-EXCHANGE IN CRYSTALLINE ZIRCONIUM-PHOSPHATES .10. CALORIMETRIC DETERMINATION OF HEATS OF NA+-H+ EXCHANGE 1A
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The heats of Na+-H+ exchange on three samples of zirconium phosphate of widely different crystallinities have been determined calorimetrically. For the crystalline sample the first 50% of exchange is exothermic with H = -6.90 0.10 kcal/mol. The second half of the reaction is endothermic with H = +6.45 0.15 kcal/mol. The corresponding entropies accompanying these reactions are -31.0 0.1 and 0.0 0.1 eu. In the case of a gelatinous, nearly amorphous, exchanger the reaction is initially exothermic but then the heat function passes through a broad maximum and becomes progressively more endothermic. The overall reaction is endothermic with H = 2.0 0.2 kcal/mol and S = -14.8 1.3 eu. The semicrystalline exchanger exhibited heat effects surprisingly similar to those of the fully crystalline exchanger. Qualitative explanations for the observed results are presented.
JOURNAL OF PHYSICAL CHEMISTRY
author list (cited authors)
CLEARFIE, A., & KULLBERG, L. H.
complete list of authors
CLEARFIE, A||KULLBERG, LH