APPENDIX. 



The methods for the preparation of the solutions, reagents, 

 and material of which use is made in the laboratory work 

 outlined in the preceding pages, are as follows: 



SOLUTIONS. 



Hydrochloric acid, 0.2 per cent; contains 6 c.c. of cone. 

 HC1 to the liter of water. 



Acetic acid, 20 per cent in water. 



Silver nitrate, 2 per cent in distilled water. 



Barium chloride, 10 per cent in distilled water. 



Picric acid, a cold saturated solution. 



Tannic acid, 5 per cent in water. 



Phosphotungstic acid, 10 per cent in water. 



Zinc acetate, 1 per cent in 95 per cent alcohol. 



Zinc chloride, saturated water solution, diluted with 

 95 per cent alcohol to a sp. gr. 1.20; filtered. 



Ammonium oxalate, a cold saturated solution. 



Alcoholic potash, 10 per cent KOH in 95 per cent alcohol. 



Iodine solution, 0.5 per cent solution of potassium iodide 

 saturated with iodine. 



Sodium alcoholate, sodium dissolved in absolute alcohol. 



Potassium permanganate -TTJ, 3.16 grms. in a liter. 



137 



