194 



XiaiTRALIZATION 



Whether one proceeds scientifically or mechanically in the 

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

 lowing: 



Molecular weight of r|uicklime, CaO, is 40 + 16 = 56. 

 Molecular weight of hydrated, CafOHjaJs 40 + 2(16 + 1) =74. 

 Molecular weight of lactic acid, C:jHijO:i, is 



(,^Xi2l+6 + f3XT6)=9o. 



But the limes are bivalent. Hence 56 pounds of quicklime 

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

 of lactic acid. 



Hence I pound of lactic acid is neutralized by y-t['-fj= .^^iii 

 pound quicklime. 



It takes 2.074 pounds of a 15-per cent mixture of quicklime to 

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

 quic'.iiime 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 .\CIDITY OF CRE.\M TO .2.5 PER CENT 



