is, 6 West and Montes: Lumbang Oil 625 
then dehydrated with anhydrous sodium sulphate, filtered, and the 
ether distilled off in a weighed flask. 
The solid acids melted at 54° and had an iodine value (Hubl) 
of 18.05. We did not have enough material to determine ac- 
curately the neutralization value and consequently did not 
calculate the mean molecular weight. We also did not endeavor 
to separate and identify the solid acids by converting them into 
their methyl esters and distilling fractionally. 16 
LIQUID ACIDS 
The ethereal solution containing the lead salts of the liquid 
unsaturated acids was shaken with dilute hydrochloric acid 
(1:4) and the lower acid layer with the precipitated lead chlo- 
ride separated. The treatment with hydrochloric acid was 
repeated and the separated ethereal solution washed thorough- 
ly with distilled water until the wash solution was no longer 
acidic, after which it was filtered through a plaited filter kept 
covered with a watch glass. The solution, which was somewhat 
turbid due to the presence of moisture, was then dehydrated 
with a considerable quantity of anhydrous sodium sulphate. 
When working on rainy days a second dehydration with sodium 
sulphate is usually necessary to render the solution absolutely 
clear. The solution was then filtered and the clear filtrate 
distilled in a 500-cubic centimeter Florence flask to eliminate 
most of the ether. When the volume of the solution was re- 
duced to about 100 cubic centimeters it was transferred to a 
200-cubic-centimeter, flat-bottomed distilling flask previously 
weighed, and the ether completely distilled off. 
The liquid acids had an iodine value (Hlibl) of 135.8. The 
neutralization value was 191.9, and the calculated mean molecular 
weight, 292.5. 
The figures given in Table 1 show the results we obtained by 
the lead-salt-ether method. 
Table 1. — Separation of the solid acids from the liquid unsaturated adds 
in lumbang oil by the lead-salt-ether method. 
Experiment. 
Oil 
used. 
Liquid 
acids. 
Solid 
acids. 
Liquid 
acids. 
Solid 
acids. 
Grams. 
Grams. 
Grams. 
Per cent. 
Per cent. 
1 - 
9. 6670 
9.0644 
0.2588 
93. 77 
2. 68 
2, 
10. 3420 
9.5474 
0.2870 
92.32 
2.77 
Mean 
93.04 
2.73 
16 Lewkowitsch, J., Chemical Technology and Analysis of Oils, Fats, and 
Waxes 1 (1913) 555 and 665. 
