6oo PRACTICAL ORGANIC AND BIO-CHEMISTRY 



vol. water) and extracted in his special form of extractor l (Fig. 85) for 24 hours 

 at 65 or longer at lower temperatures, several pieces of broken porcelain being 

 added to the ether in the boiling flask. The ether is distilled off below 80, 

 water is added, the solution boiled for i minute and made up to 50 or 



70 C.C 



A TO B = 30 INCHES 



AroC=iO Jl 



FIG. 85. 



ioo c.c. in a measuring flask. If there be much pigment, it is preferable to 

 allow the solution to stand for 24 hours. The solution is filtered and its acid 

 value determined by titration as well as its rotation by the polarimeter. The 

 two values generally agree closely although slight traces of sulphuric acid are 

 usually present. 



1 In filling the extractor the aqueous solution is poured in until it reaches the middle of 

 the last and top bulb but one. 



