Oxidatiofz by Nitrous and Nitric Acid. Part IV. 3971 773. Oxidation by Nitrous and Nitric Acid. Part IV.* 8pectroscopic Investigation of the Equilibrium between NO+ and Nitrous Acid in Aqueous Perchloric Acid. By K. SINGER and (MISS) P. A. VAMPLEW.The disappearance of the absorption spectrum of molecular nitrous acid (weak maxima between A 3400 and 3900 . &) and the appearance of a strong absorption band (hx. 4200 at 2600 A), attributed to NO+, are perceptible in 45% and complete in 58% (w/w) perchloric acid. Spectrophotometric measurements show that molecular nitrous acid and NO+ account, within the limits of error ( f5Y0), for the total " analytical " nitrous acid in 1-68y0 aqueous perchloric acid.
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