ON THE VELOCITY OF CHEMICAL REACTIONS 27 



In this experiment the spiral tube contained about 100'^'= of the 

 solution. The length of the capillary tube A B was 36*^™, and its 

 cross section about l^qmrn^ ^j^q temperature was 25°-872 C. 



The first two columns of the following table contain the readings of 

 the end of the mercury column, on a metal scale attached to the capillary 

 tube, together with the corresponding intervals of time t in minutes. 



After allowing the apparatus to stand 24 hours and the reaction 

 to become practically completed, the bath was heated up again to 

 25°-872 C, allowing all of the mercury which had been drawn into 

 the spiral to run out. The end of the mercury column then stood at 

 the mark -20, which is the zero corresponding to zero quantity of 

 cane sugar in the solution. The third column in the table contains 

 the readings referred to this zero. 



Under the assumption that the volume of the solution is an 

 additive function of the constituents, these latter distances represent- 

 ing the changes in volume should be proportional to the quantities 

 of cane sugar left in solution. The last column contains the values 



of ——-—calculated from the formula 



