In an electrochemical cell (without diffusion potential) responding reversibly to Na+ ions and solvated electrons e-(or alternately to hydrogen) we determined the thermodynamics of the reaction HzO + e-(+Na+) F= l/zHz + OH-(+Na+) in liquid ammonia. The combination of data with those for the reaction NH4+ + e-* l/zHz + NH3 also in ammonia yields the thermodynamics of the dissociation reaction NH3 + HzO * NH4+ + OH-.We obtain K = 6 X (-40 "C, dimensionless) and AH = 21 f 6 kJ/mol. K is by almost 10 powers of ten smaller than reported on the basis of conduction experiments, but well within the range of data estimated from the partial molar thermodynamic quantities of species involved in the equilibrium. The very small dissociation constant of NH3 + HzO in ammonia as compared to that of the same reaction in water (3 X lo-' at 25 "C) is mainly due to the differences of entropies of the species in both solvents.
It was our judgement that the inclusion of a spectrum of mirex and the trace of the m/z 546 response were not required to substantiate these results. This explanation appears to have satisfied the majority of reviewers, since the article was publisKed as such after our written comments.In conclusion, we feel that our regression analysis data indicate that the MS-SIM and GC-EC methods of operation can provide reliable results, using the described procedure.
LITERATURE CITED(1) Onuska, F. I.; Comba, M. E.: Coburn, J. L. Anal.
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