252 QUANTITATIVE ANALYSIS. 



Potassium Ferrocyanide, 1 : 10. 



Potassium Hydroxide. One part of potassium hydroxide 

 (pure, fused) to two parts of water. 



Potassium Nitrate. Must be free from chlorides and sulphates. 



Potassium Sulphocyanate, 1 :20. 



Rosolic Acid, one part in 100 to 200 parts of alcohol. 



Silver Nitrate, 1:50. 



Sodium Carbonate. Dehydrated and a saturated solution, 

 must be free from chlorides and sulphates. 



Sodium Chloride. Cold saturated solution (water shaken for 

 some time with an excess of powdered sodium chloride). 

 One hundred cubic centimeters of the solution contain 

 31.84 g. of sodium chloride. 



Sodium Hydroxide, containing about 15 g. of sodium hydrox- 

 ide in 100 g. of the solution, specific gravity 1.17. 



Sodium Phosphate, Na 2 HP0 4 , 1 : 10. 



Sulphuric Acid. By this term is always meant, unless other- 

 wise stated, an acid containing 200 g. of concentrated 

 sulphuric acid in the liter. 



Tartaric Acid, pulverized. 



Turmeric-paper. Digest powdered turmeric-root with alcohol, 

 dip bibulous paper in the solution, and dry in the air. 



Zinc Chloride Solution, alcoholic. Thick, sirupy, aqueous 

 solution diluted with alcohol until the specific gravity 

 is 1.2. 



