Many of the propositions of chemistry, like those of mathematics, are susceptible of easy demonstration. To this class belong the following:
1. When 50 c.c. of fluid containing 0.5 gram of sodium carbonate, 50 mgm. of ammonia, and 25 mgm. of acetone is distilled, the entire amount of the NH3 and CH3.CO. CH3 will pass over with the first 25 c.c. of distillate. This proposition is certainly true, but it is equally certain that it is not generally known. If it were, we should not be directed, as we usually are by text-book writers, to collect the acetone from urine by distilling 100 c.c.—or less—until seven-eighths of the fluid has passed over.1 Nor should we have been cautioned
KING RW. A SIMPLE, RAPID, AND ACCURATE METHOD FOR THE DETERMINATION OF AMMONIA AND ACETONE IN URINE. JAMA. 1909;LIII(21):1738–1740. doi:10.1001/jama.1909.92550210033002c
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