133 



Butyric acid 88 



Capraic acid 116 



Caprylic acid 146 



Capric acid 172 



V. 



CALCULATION OF MIXED GLYCERIDES. 



To calculate the mean 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 required to saponify one gram 

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

 glycerides. 



[Ri 

 C3H5 iR2 + 3 K(OH) = aHsCOH)., + K (R, R. R3) (I) 

 [Rs 

 Then it follows directly that 



3f5f).12) X ion , , . , , 



X : 3(56.12) :: 1 : Sap. Val. or x moan molecular of the gly- 



Sap. Val. 



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



56.12 x 100 ^^ , , 



soluble acid x = Moan molecular weight. 



Sap. Val." 



VI. 



CALCULATION OF GLYCEROL. 



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

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

 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 necessary to saponify one gram of fat. The amount 

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



30.667 X Sap. Val. 



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



56.12 



amount of glycerole in one gram of fat and multiplying this by 100 gives the 

 «S.Tponifi cations value.s are expressed in milligrams in the calculations. 



