Text-book of medical and pharmaceutical chemistry . d water is added to a retort holdingabout a half liter. To this is added 2 c. c. of the sodium carbonate retort is connected with a Liebigs condenser by an air-tight joint made 142 MEDICAL CHEMISTRY. by a piece of black rubber tubing of large caliber slipping over both the retortand condenser. The beak of the retort is bent at such an angle that the lowerend may be attached to the block tin tube of the condenser as shown by (). A lamp is now brought under the retort and the water rapidly boileduntil 10 c. c. of it shows no
Text-book of medical and pharmaceutical chemistry . d water is added to a retort holdingabout a half liter. To this is added 2 c. c. of the sodium carbonate retort is connected with a Liebigs condenser by an air-tight joint made 142 MEDICAL CHEMISTRY. by a piece of black rubber tubing of large caliber slipping over both the retortand condenser. The beak of the retort is bent at such an angle that the lowerend may be attached to the block tin tube of the condenser as shown by (). A lamp is now brought under the retort and the water rapidly boileduntil 10 c. c. of it shows no leaction with Nesslers reagent. 100 of thewater under examination is now put into the retort by means of a funnel, andthe boiling continued slowly, removing the distillate when 10 c. c. are distillates of 10 c. c. each usually contain all the ammonia existing in thewater as salts of ammonia. Many prefer to use 500 of the water insteadof 100 c. c. and distill tff 50 c. c. of the solution for Nesslerizing. The author Fig prefers the smaller quantities, using smaller tubes graduated at 10 c. c. Theprocess of Nesslerizing is conducted as follows : c. c. of the Nesslerssolution is measured into each of the four distillates and mixed by weaker ammonia solution i> now added 10 10 c. c. of the ammonia-freewater in another cylinder, until the color jiroduced with c. c. of Nesslerssolution is equal to that in the first distillate removed. Each distillate is imi-tated by a known amount of ammonia in the same volume of liquid. Somechemists recommend to add ^ of that found in the first distillate as an averageamount to be found in the remaining ones. When about 40 c. c. have distilledover, the lamp is removeti and 10 c. c. of the alkaline permanganate solution isadded to the retort, and the distillation slowly continued, setting aside each HYDROGEN AND OXYGEN. 143 distillate when 10 c. c. are collected. These distillates are again Nessl
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