76 



MASS. EXPERIMENT STATION BULLETIN 151. 



The amount (H) of such a compound in an oil, fat or wax is therefore — 



H=, 



42.016 d 



Molecular Weight of Hydroxy Compounds. 

 The molecular weight of the hydroxy compounds can be calculated 

 from the weight (w) of fat taken and the increase (i) on acetylating, pro- 

 vided the number (d) of hydroxyls in the molecule is known : — 



w : w+i = m :m+42.016 d 

 m = 42.01 6 dw 



The formation of anhydrides during the acetylating process will affect 

 the accuracy of these calculations. 



The computation of the amount of hydroxy compounds by the gravi- 

 metric process is greatly facilitated by use of the following table : — 



Acetyl Gravimetric Process on Original Product. 



Glycerides. 



Monoglycerides. 



Monopalmitin, 

 Monostearin, 

 Monolein, , 



330.304 

 358.336 

 356.320 



3.93069 

 4.26428 

 4.24029 



Diglycerides. 



Hydroxy Acids. 



Ricinoleic, 

 Dihydroxystearic. 



298.272 

 316.288 



340.288 

 400.320 



. 140865 

 .265682 



7.09900 

 3.76390 



1 Acetyl number = 1335.39604 i. 



