APPENDIX 539 



PREPARATIONS OF SOLUTIONS 



Ammonium Molybdate. Dissolve 1\ gm. of ammonium molybdate .in 

 50 cu. cm. of water. Add a little water if necessary. Pour the mixture, with 

 constant stirring, into a mixture of 25 cu. cm. of concentrated nitric acid and 

 25 cu. cm. of water. Allow it to stand for several days. 



Barium Chloride. Dissolve 1 oz. (28 grams) of barium chloride in 200 

 cu. cm. of water. 



Fehling's Solution. Dissolve 7 gins, of crystallized sulphate of copper 

 in 100 cu. cm. of water for solution A. 



Dissolve 34.6 grams of Rochelle salts in 45 cu. cm. of water and 25 grams 

 of caustic soda in 40 cu. cm. of water. Mix. Add enough water to make 

 100 cu. cm. for solution B. 



When ready to use mix equal parts of A and B. 



Iodine. Agitate 2 grams of crystal iodine with a solution of 6 grams of 

 potassium iodide in a little water. When the iodine is dissolved, add enough 

 water to make 100 cu. cm. of the solution. 



Phenolphthalein. Dissolve ^ gram in 100 cu. cm. of alcohol. 



Sodium Hydroxide. Dissolve 20 grams of caustic soda in 100 cu. cm. 

 of water. 



