A New Oxide of Nitrogen, Nitroso-Nitrogen Trioxide, and Its Bearing on the Oxidation of Nitric Oxide

Abstract

Was used and, being a father weak acid, this exaggerated the effect. The Same titration using a 0.2cc. offset gave the curve shown in Fig. 5. It is quite possible to decrease the offset further if great care be observed to ascertain that the burets are quite accurate. If such care be not observed small and irregular potential readings may be obtained or else the cusps may turn downward indicating that the wrong buret is in the lead. For ordinary use with 0.1 N or 0.05 N solutions an offset of 0.2 cc. has been found to be most satisfactory. SummaryIt has been found that in many cases the method described above and referred to as "differential titration" is simpler and more accurate than electro-titration as usually practised. The reasons for this are summarized as follows.1. The necessity of plotting curves is eliminated.2. The use of the troublesome calomel half-cell is avoided.3. Slight errors due to "drifting" (very slow change of potential at an electrode upon standing) are compensated. 4. By the use of solutions almost identical in composition all trouble from diffusion is avoided.