of Acids by Carbohydrates. 



555 



Hydrogen Bromide. Experiment III. 



Weight of carbohydrate, 0*5 gm. 



Temperature, 17° C 



Time of experiment, 18'5 hours. 



Volume of solution of acid in chloroform added, 30 c.c. 



Strength of solution, O'OOfilSgm. per c.c. 



Weight of acid added, 01839 gm. 



Concentration experiments with Hydrogen Bromide. 



One gram of cellulose, dried for several hours at 100° C, was 

 weighed into each of five stoppered vessels, 10 c.c. of dry carbon 

 tetrachloride were added to each and the mixture was allowed to 

 stand for some time so that the cellulose might become fully 

 saturated with solvent: various quantities of a solution of hydrogen 

 bromide in the same solvent were added to each respectively and 

 the volume was made up to 70 c.c. with dry solvent. 



After standing for eighteen hours, at the ordinary temperature, 



