of Acids by Carbohydrates. 



553 



If the corresponding values of log - and oi log Cj + log k be 



plotted against each other, the curve obtained is approximately a 

 straight line. 



These concentration experiments were repeated with cane 

 sugar, a carbohydrate which blackens in contact with the acid 

 and which gives fairly large quantities of chlororaethylfurfural- 

 dehyde when heated with hydrogen chloride under pressure. 



One gram of finely-powdered cane sugar was treated with a 

 known quantity of pure solvent, then with various quantities of 

 a standard solution of the acid in dry carbon tetrachloride and the 

 volume was made up to 80 c.c. with dry solvent. 



The mixture was left at the temperature of the room for 

 18 hours and the amount of acid remaining in solution was 

 determined as before. 



1 c.c. of solution contained 0"0026 gm. of hydrogen chloride. 



Cane Sugar. 



Here again the exponential formula was used and n determined 

 by substituting the values of Ci and c^ in the expression 



^ ^ log Ci - log c/ 

 logC2-logc/' 



where Ci, c/ &c. are the various values of Ci; Co, Ca' (Sec are the 

 corresponding values of C2. 



If w be calculated as before, the following results are obtained: 



0-52, 0-57, 0-56, 052. 



Mean = 0-54. 



