Coprecipitation from Homogeneous Solution

Abstract

11.38%), after 1.5-hour digestions, in 39 trials yielded an average of 10.70y0 of nitrogen (94%), with maximum of 11.39% and minimum of 9.27%. For 6-methoxysalicylaldazine ( N = 8.98%) five trials, involving 2.5-hour digestions, gave an average of 9.03%, with maximum 9.15% and minimum 8.9070. Some of the low results may be attributed to loss caused by irregular but sometimes violent bumping during the reductions.Nine analyses of nicotinic acid, R-ith 30-minute digestions, yielded results all of wh,ich are acceptable, averaging 11.247, (maximum, 11.487,; minimum, 11,0470); adenine treated in the same way liberated ammonia during reduction. For general use a trap to retain volatilized ammonia would be needed, but a selective determination of nitrogen so liberated and total nitrogen might be possible.Electrolytic Reduction of nicotinic acid, in 80% sulfuric acid, using platinum electrodes and a current of 0.7 ampere a t 4 volts, followed by digestions for 30 to 90 minutes, yielded in three trials one good result (11.41%) and tn-o Ion. results (