Abstract
The experimental results recently published[1]led to the idea that for 15N/ 14N isotopic exchange between nitric oxide and dilute nitric acid[2, 3], the slowest stage should be the formation of nitrous acid in solution. The influence of the gaseous phase composition (NO, NO 2) and of the gas-liquid contact time on the rate of the NO, NO 2HNO 3 isotopic exchange has been measured. The influence of the nitrous acid on the above-mentioned isotopic exchange has been also measured by: 1. (1) Introducing sodium nitrite solution in the liquid phase before the two phases come into contact. 2. (2) Preequilibrating the nitric acid solution with the nitric oxide at atmospheric pressure, and then measuring the rate of the isotopic exchange. On the basis of these results, the mechanism of the NOHNO 3 exchange reaction is discussed.
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