79 



Ferric-Hydrochloric Acid Indican Reagent. (Obennayer's 

 Reagent). Dissolve 2 grams of solid ferric chloride in 500 cc. of 

 concentrated hydrochloric acid. Sp. gr. 1.19. 



Hypobromite Solution. Dissolve 40 grams of caustic soda 

 in 100 cc. of distilled water. To 23 cc. of this solution add 2 cc. 

 of bromine. To this mixture add an equal volume (25 cc.) of 

 water. The solution is not very stable and is best made up • as 

 needed. 



Lugol's Solution. 



Iodine, 2.5 grams 



Potassium iodide, 5. grams 



Distilled water to 50. cc. 



This may ordinarily be diluted 1 to 5 or 10 for urine work. 



Magnesia Mixture. 



Magnesium sulphate, 1 part 



Ammonium chloride, 1 part 



Ammonia water, 1 part 



Distilled water, 8 parts 



Millard-Roberts Reagent. 



Nitric acid. 1 part 



Sat. Sol. Magnesium Sulphate, 5 parts 



Mohr's Volumetric Method for Chlorides. 



Solution 1. Fused silver nitrate, 29.075 grams 



Distilled water to make, 1000. cc. 



Solution 2. Neutral potassium chromate, 10. grams 

 Distilled water to make, 100. cc. 



Nylander's Reagent. Digest 2 grams of bismuth subnitrate 

 and 4 grams of Rochelle salt in 100 cc. of a 10% solution of 

 potassium hydroxide. The reagent should then be cooled and fil- 

 tered. 



Phenolphthalein. Dissolve 1 gram of phenolphthalein in 

 100 cc. of 95% alcohol. 



