1901).] 



PUBLIC DOCUMENT — No. 31. 



133 



(h) Mean Molecular Weight. 



The molecular weight (m) of the insoluble fatty acids can 

 be calculated from the neutralization number (n) by means 

 of the formula : — 



56158 2000 X wt. of acids 

 m = or 



n 



c.c. N/2 alkali 



(c) Iodine Number. 



The iodine number indicates the percentage of iodine chloride 

 absorbed l)y the insoluble fatty acids, expressed in terms of 

 iodine. 



The same process, on a weighed amount of insoluble fatty 

 acids, is followed as in the case of an oil or fat. Particular 

 attention should be paid to the separation and drying of the 

 insoluble fatty acids, so as to prevent oxidization of the unsat- 

 urated acids. 



8. Calculated Data feo:m the Fatty Acids. 



Glycerides. — The percentage of triglyceride (Gl) can be 

 calculated from the percentage of any fatty acid (A) by means 

 of the molecular weight (m) of the fatty acid. 



Gl=^-^t^^XA. 

 3 m 



From the above formula the following factors were deduced 

 for the acids enumerated below : — 



T.auric acid, Cio H24 O2, 

 Myristic acid, Cu H28 O2, 

 Palmitic acid, Cig H32 Oo, 

 Stearic acid, Cig Hg,; Oo, 

 Oleic acid, C18 H34 O2, 

 Linolic acid, Cj^ H32 O2, 



9. Iodine Number. 

 The iodine number indicates the percentage of iodine 

 chloride absorbed by an oil, fat or wax, expressed in terms of 

 iodine. 



