TESTING MILK AND CREAM FOR ACID 



599 



appears, add more alkaline solution from the burette: When the 

 test is completed divide the number of c.c. tenth normal alkaline 

 solution required to produce the pink shade, as indicated on the 

 graduation of the burette, by 20. The result represents per cent 

 acid. ^ N 



Example. 12 c.c. -r^ NaOH are needed to neutralize the 18 c.c. 

 of milk or cream. 



12 



20 



= .6 per cent acid. 



rig-. 85. Nans Alkali Bottle and Burette for Acid Test 

 Courtesy of Louis F. Nafls 



Farrington Alkaline Tablet Test. Apparatus Needed. One 



100 c.c. graduated glass cylinder with stopper; one 17.6 c.c. Bab- 

 cock pipette; one white cup. 



Reagents. Farrington Alkaline tablets. 



Making the Test. Dissolve 5 tablets in 97 c.c. w r ater in the 

 glass cylinder. As these tablets require about six hours for com- 

 plete solution it is advisable to place the tablets in the water in the 

 cylinder on the evening before the day when the solution is to be 



