BOUILLON. 61 



of bouillon were employed, then, for the whole amount 

 of 1 litre, just 100 times as much, minus that for the two 

 samples used in titration, will be needed. For example : 

 To neutralize 10 c.c. of bouillon, 2 c.c. of the diluted 

 (0.4 per cent.) caustic soda solution were employed. For 

 the remaining 980 c.c. of the litre of bouillon, then, 

 200 c.c. ( 4 c.c., the amount employed for the two 

 samples of 10 c.c. each of bouillon) is needed of the 0.4 

 per cent, solution, or one-tenth of this amount of the 4 

 per cent, solution. 



For the neutralization of the whole bulk of the bouillon 

 it is better to employ the strong alkaline solution, as by 

 its use the volume is not increased to so great an extent 

 as when the dilute solution is used. 



It is evident that this method is much more exact than 

 that ordinarily employed, but at the same time it must 

 be remembered that for its success it requires exactness 

 in the measurement of the volumes and the preparation 

 of the dilutions. To obviate error, it is better to employ 

 this method when the solutions are all cool and of nearly 

 the same temperature, so that rapid fluctuations in tem- 

 perature, and consequent alterations in volume, will not 

 materially interfere with the accuracy of the results. 



This method of neutralization, which is employed by 

 Schultz, is to be recommended for those experiments in 

 which slight inaccuracies in the reaction of the media 

 play an important part. 



For the ordinary purposes of the beginner, however, 

 results quite satisfactory in their nature may be obtained 

 by the employment of the saturated soda solution for 

 neutralization and the litmus paper as the indicator. 

 For some time, however, it has been our practice to 

 4 



