133 



Butyric acid 88 



Capraic acid 116 



Caprylic acid 1 46 



Capric acid 172 



V. 



CALCULATION OF MIXED GLYCERIDES. 



To calculate the moan molecular weight of the mixed glycerides of the 

 butter fat we make use of the saponification value. This value represents 

 the number of milligrams of potassium hydrate recjuired to saponify one gram 

 of fat. By use of the following equation for the saponification of any tri- 

 gl veer ides. 



CHs ^Ro + 3 K(OH) = CHsfOH),, + K (Ri R, Ra) (I) 

 IRs 

 Then it follows directly that 



•'^^56.12) X 100 , , . , , 



X : 3(56.12) :: 1 : Sap. V al. or x mean molecular of the glv- 



Sap. Val. 



ceride. Likewise we obtain the mean molecular weight of the mixed in- 



, , 56.12x100 



soluble acid x = Mean molecular weight. 



Sap. Val."^ 



VI. 



CALCULATION OF GLYCEROL. 



By making use of the saponification ecpiation (I) in our calculation we 

 can calculate the per cent, of glycerole in mixed triglycerides. From equa 

 tion (I), 3 K OH = 92 parts of glycerole, i. e., 3(56.12) = C3H5(OH)3 = 92,- 

 molecular weight of glycerole or 56.12 grams of K OH correspond to 30.667 

 grams of glycerole, and from the saponification value we have the amount 

 ot K OH necessai-y to saponify one gram of fat. The amount 



of glycerole in one gram of fat is determined by use of the following proportion 



.. .^ r. . r, . , 30.667 x Sap. Val. 



56.12 : 30.667 :: Sap. Val. : x, x = - 



56.12 

 amount of gh'cerole in one gram of fat and multiplying this by 100 gives the 



'Saponifications values are expressed in milligrams in the calculations. 



