Perchloric acid.mono-hydrate

Preparation. It was first prepd in an impure form by Hantzsch who isolated a ciyst solid when anhyd nitric and perchloric acids were mixed. He reported the solid to be 0N(0H)2+.C104 (Ref 2), but later work by Goddard and coworkers showed this solid to be a mixt of nitronium perchlorate and perchloric ac mono-hydrate (Ref 4). It is best prepd by distilling anhyd perchloric ac onto an excess of dry dinitrogen pentoxide at -80°, the mixt allowed to warm to room temp, and the mixt pumped under vacuum for 2 days to remove volatiles. The residue was shown by analysis to be a mixt of 89 mole % nitronium perchlorate and 11 mole %... 

Hydrogen peroxide, cuprum perchloride, and perchloric acid were used as acceptors in aqueous solutions. The experimentally observed process of hydrated electron decay in solutions of these three substances obeyed the first-order reaction law. Kinetic characteristics of observed processes were calculated by the method of the least squares using 15-20 photo-oscillograms. Values of rate constants of corresponding pseudo-first order reactions are shown in Table I. There one can see also values of bimolecular rate constants calculated on the basis of above data. The rate constant does not vary occasionally within some limits but it changes monotonously with the variation of concentration. This may mean that some process of the decay of the intermediates was not taken into consideration. It was shown in earlier work (J), that we had satisfactory agreement with the experiment supposing that the process was the mono-molecular intermediates decay. 

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