76 



MASS. EXPERIMENT STATION BULLETIN 151. 



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



H = , 



im 



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 hydro xyls in the molecule is known: — 



w : w+i = m : m +42.01 G d 

 _ 42.016 dw 

 i 



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. 



Dipalmitin, 

 Distearin, . 

 Diolein, 



568.544 

 624.608 

 620.576 



610.560 

 666.624 

 662.592 



.073901 

 .067268 

 .067705 



13.53162 

 14.86591 

 14.76996 



« .\cetyl number = 1335.39604 i. 



