40 MILK 



alcoholic solution of phenolphthalein added and 

 the titration made with standard alkali. Thomer 

 proposes that the number of c.c. required should 

 be multiplied by lo and the result termed the 

 "degree of acidity." Fresh normal milk will 

 show figures ranging from i6 to i8. When the 

 degree of acidity is 23 or over, the sample will 

 coagulate on heating. 



The process involves a slight error, in that the 

 addition of a notable amount of water to a milk 

 sample disturbs somewhat the relation of the 

 phosphates and diminishes the acidity. It may 

 be advisable to titrate 'the undiluted milk. If 

 the number of c.c. used is multiplied by 0.9 the 

 lactic acid equivalent to the acidity of the sample 

 is given in grams per 1000 c.c. 



