APPENDIX. 139 



Fehling's Solution. 



A mixture in equal volumes of the following solutions: 



1. Copper sulphate solution, 69.28 grms. crystalline 

 CuS0 4 dissolved in water and made up to a liter. 



2. Alkaline tartrate solution, 346 grms. crystalline Ro- 

 chelle salts dissolved in 350 c.c. of water and 250 grms. 

 NaOH dissolved in 300 c.c. of water; these two mixed and 

 the volume made up to a liter. 



Hammarsten's Reagent. 



I volume HN0 3 and 19 volumes HC1 (both acids about 

 25 per cent). This acid mixture should be kept at least a 

 year. Then mix with it four times its volume of 95 per 

 cent alcohol. 



Hopkins-Cole Reagent. 



60 grms. sodium amalgam added to 1 liter of a saturated 

 solution of oxalic acid. After the development of gas has 

 ended, filter and dilute with 2 or 3 volumes of water. 



Hypobromite Solution. 



Mix 100 c.c. of each of the following solutions and dilute 

 with 300 c.c. of water. 



1. 125 grms. bromine and 125 grms. sodium bromide 

 dissolved in water and the volume made up to 1000 c.c. 

 Keep in stoppered bottle. 



2. A solution of sodium hydrate with a sp. gr. 1.250. 



Magnesium Mixture. 



100 grms. MgS0 4 and 200 grms. NH 4 C1 dissolved in 800 c.c. 

 of water; to this add 400 grms. concentrated NH 4 OH. 

 Mix thoroughly and keep in glass-stoppered bottle. 



