194 



NEUTRALIZATION 



Whether one proceeds scientifically or mechanically in the 

 preparation of his lime mixture, his work is based upon the fol- 

 lowing: 



Molecular weight of quicklime, CaO, is 40+16 = 56. 

 Molecular weight of hydrated, Ca(OH) 2 , 1540+2(16+1) =74. 

 Molecular weight of lactic acid, CaHoOa, is 



But the limes are bivalent. Hence 56 pounds of quicklime 

 or 74 pounds of slaked lime will neutralize twice 90, or 180 pounds 

 of lactic acid. 



Hence i pound of lactic acid is neutralized by -f/^ = .^in 

 pound quicklime. 



It takes 2.074 pounds of a i5-per cent mixture of quicklime to 

 supply .3111 pound of quicklime. Hence 2.074 pounds of the 

 quicklime mixture will neutralize i pound of lactic acid, or reduce 

 the acidity of 1000 pounds of cream o.i per cent; and it is upon 

 this figure, which is theoretically correct, that the following table 

 is based: 



TO REDUCE THE ACIDITY OF CREAM TO .25 PER CENT 



