138 APPENDIX. 



Potassium mercuric iodide, same as Tanret's reagent 

 without the addition of acetic acid. 



REAGENTS. 



Ammonium Molybdate. 



50 grms. molybdic acid dissolved in 200 grms. 10 per cent 

 NH 4 OH; pour this solution slowly into 750 grms. HNO 3 

 (sp. gr. 1.2); allow the mixture to stand for several days; 

 then filter. 



Ammoniacal Silver Nitrate. 



2.5 per cent in water; to this is added NH 4 OH until the 

 precipitate is completely dissolved. 



Barfoed's Reagent. 



4 per cent copper acetate in water; the solution made 

 .faintly acid with acetic acid and filtered. 



Benedict's Solution. 



Dissolve with heat 173 grams of sodium citrate and 100 

 grams of anhydrous sodium carbonate in about 600 c.c. of 

 water. Dissolve 17.3 grams of cupric sulphate in about 150 

 c.c. of water. Mix the two solutions by slowly pouring the 

 cupric sulphate into the carbonate-citrate solution. Make 

 the volume up to 1000 c.c. 



Bial's Reagent. 



500 c.c. of 30 per cent HC1 in which are dissolved 1 grm. 

 of orcinol and 25 drops of a 63 per cent solution of crystalline 

 ferric chloride. 



Esbactis Reagent. 



10 grms. picric acid and 20 grms. citric acid dissolved 

 in a liter of water. 



