624 
The Philippine Journal of Science 
1921 
in a liter flask by heating (reflux) for two hours with 100 cubic 
centimeters of half normal alcoholic potassium hydroxide. The 
alcohol used in preparing the potassium hydroxide solution was 
previously purified by Dunlap’s method, 15 which consists in treat- 
ing the alcohol with silver nitrate and potassium hydroxide, heat- 
ing (reflux), and distilling. The reaction product obtained by 
saponifying lumbang oil was treated with a few drops of 
alcoholic phenolphthalein solution and acidified with glacial acetic 
acid, after which it was neutralized with half normal alcoholic, 
potassium hydroxide solution. The bulk of the alcohol was then 
eliminated by distillation. Sixty cubic centimeters of 10 per 
cent lead acetate solution were diluted with 300 cubic centimeters 
of distilled water, brought to boiling, and gradually added with 
frequent shaking to the residue in the flask. The flask was then 
filled completely with hot distilled water, and allowed to cool. 
Upon cooling, the solution in the flask became clear and the lead 
soap adhered to the flask. The clear solution was then decanted 
to a filter paper, and the lead soap in the flask was washed four 
or five times with hot water until no more traces of lead acetate 
could be detected in the washings. Each time the lead soap 
was washed the solution was cooled before decanting. 
To the lead soap in the flask, 300 cubic centimeters of ether 
previously purified were added and the resulting ethereal mix- 
ture was heated (reflux) on a water bath with frequent shaking 
for about half an hour until most of the lead soap was apparently 
dissolved. The ethereal solution was then allowed to stand for 
twenty-four hours, after which it was filtered through a plaited 
filter kept covered with a watch glass. The residue on the filter 
paper containing the lead salts of the solid saturated acids was 
washed thoroughly with ether. The ethereal filtrate containing 
the lead salts of the liquid unsaturated acids was placed in a 
flask, stoppered securely, and set aside in a dark closet until the 
work on the lead salts of the solid acids was completed. 
SOLID ACIDS 
The precipitate of the lead salts of the solid fatty acids to- 
gether with the filter paper was placed in a flask and boiled about 
an hour with 200 cubic centimeters of dilute hydrochloric acid 
(1:4). The solution was then cooled, and the solid acids re- 
sulting from the decomposition of their lead salts were extracted 
with ether. The ethereal layer after separating from the acid 
solution was washed with water until free from acid. It was 
15 Dunlap, F. L., Journ. Am. Chem. Soc. 28 (1906) 397. 
