38 



perature rises. That is, Calcium Hydroxide is more soluble in cold 

 than in hot water. 



Lime 5.0 Gm. 



Distilled Water, a sufficient quantity. 



Slake the lime by the very gradual addition of 100 mils of Dis- 

 tilled Water, and agitate occasionally during half an hour. Allow 

 the suspended particles to subside, decant the supematent liquid and 

 reject it. 



Transfer the magma of calcium hydroxide to a filter and wash 

 it repeatedly with boiling distilled water, until the washings, after 

 acidulation with nitric acid show not more than a faint cloudiness 

 with silver nitrate (T. S.) Eteturn the magma to a suitable con- 

 tainer, add 500 mils of distilled water, agitate it thoroughly, let the 

 mixture stand for 24 hours, agitate again, and when the coarser par- 

 ticles of solid matter have subsided, pour the liquid containing the 

 undissolved calcium hydroxide in suspension into a tightly stoppered 

 bottle, so as to keep the solution saturated. Pour ofE the clear solu- 

 tion when required for use. From time to time shake the bottle to 

 insure a saturated solution. 



Description : — A clear, colorless liquid without odor and having 

 an alkaline taste. The object of slaking the lime with a small 

 amount of water which is rejected is because most commercial lime 

 contains calcium chloride which is irritant. This is easily soluble. 

 Consequently, by macerating and washing the lime with water, 

 practically all the calcium chloride will be removed. Since the cal- 

 cium hydroxide is but sparingly soluble in water, only a small 

 amount will be thrown away with the first water. 



Use : — Antacid. 



Liquor Cresolis Compositus — Compound solution of eresol 



Cresol 100.0 Gm. 



Linseed Oil 60.0 Gm. 



Potassium Hydroxide 16.0 Gm. 



Alcohol 6.0 mils 

 Water, a sufficient quantity 



to make 200.0 Gm. 



