THE PRKPARATION AND USE fiF LBIE AS A XEUTRAEIZER 195 



The common practice in creamery work is to measure tlic 

 lime mixture, in adding it Id the cream, instead of weighing it. In 

 case this is done the mixture should l^e made up so that there 

 will be 12.5 pounds of cjuicklime in 10 gallons of the mix, that is, 

 this Cjuantit}' of lime shoukl be mixed with about 8 gallons of hot 

 water and then brought up to 10 gallons h\ adding sufficient hot 

 water. This water to be added should be heated in an ojien \-essel 

 so as to drive off any carbonic acid gas there ma}- be in it, and 

 should not be added direct!}- from a hose or tap. 



In 10 gallons of the mixture there are 12.5 pounds lime. 



In I cjuart of the mixture there is ^ =.^,12^ pound lime. 



40 



We have alread}- shown that .3111 jjound Ciuicklime will 



reduce the acidit}" of 1000 pounds cream .1 per cent. Hence, i 



quart of the lime mixture, which contains .3125 pound cjuicklime, 



will reduce the acidit\' of 1000 pounds cream ^^ = .1004 



.3111 



per cent = .i per cent practicall}'. Or, i pint of the lime mixture 



will reduce the acidity of 1000 pounds cream .05 per cent. It 



is upon these figures that the table on page 196 is based. 



How many pints of lime mixture will it take to reduce the 

 acidity of 3400 pounds of cream from .70 to .25 per cent? In the 

 column under .70 and opposite 3400, this is gi^'en as 30.5 pints. 

 The same cjuantity of hme mixture would be used for all acidities 

 nearer to .70 per cent than either .65 per cent or .75 per cent. 

 This principle applies all through the table. 



Note the simple numbers opposite 1000 pounds of cream. 

 The quantit}- of mixture required for an}- weight of cream can be 

 quickly determined b}- multiplying the weight of crean-i b}- the 

 amount of mixture required to reduce the acidit}' of 1000 pounds 

 of cream to .25 per cent and dividing by 1000 (or pt)inting off 

 three decimal places) . Example : 



How man}- pints of lime mixture will be required to reduce the 

 acidit}' of 6300 pounds of cream from .80 per cent to .25 per cent? 



1000 pounds of cream require 1 1 i)ints of mixture. 



6300 pounds of cream recjuire 11 X6. 300 = 69. 3 =69.5 pints of 

 mixture. 



