Inorganic Chemistry and at 1 atm. and 25°it follows that is 21 M~l.This value is in agreement with Bray and Hershey8 and Badoz-Lambling9 but is higher than the values reported by other investigators. Similar analysis for the Fe(N03)s-HN03 solutions using a value of 50 for A°FeNos+s yields a J?FeNo3+2 of 5.7 M~l, which is in reasonable agreement with the results of Sykes10 but again higher than the value reported by some other investigators.Repeating these calculations at the higher pressures we find that the formation constant of FeCl+2 decreases 20-fold from 21 to 0.4 M~l in going from 15 to 30,000 p.s.i., whereas the formation constant of FeN03+2 decreases only from 5.7 to 4.6 M~l in going from 15 to 70,000 p.s.i.One might expect that the effect of pressure on ionpair formation should be less than upon true complex ion formation inasmuch as the former requires fewer alterations in solvation and, hence, does not entail large volume changes. Such being the case, the present results suggest that FeCl+2 is a complex ion, but that FeN03+2 is an ion pair, that is to say, the composition of the innermost hydration spheres of the participants is unchanged.Acknowledgments.-We wish to acknowledge the valuable assistance of Professor R. M. Fuoss of Yale
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