Acetone % (vol.) 



&! x 10 4 



k 2 x 10* 







13-58 



9-13 



20 



12-28 



7-98 



40 



10-33 



6-02 



60 



7-91 



3-91 



80 



7-51 



2-27 



132 G. J. BURROWS. 



In Table VIII are given the mean results obtained for 

 the rates of hydrolysis of 5 per cent, methyl acetate in 

 acetone-water mixtures at 25° O. 



In this table fci is the rate of hydrolysis by N/2 hydro- 

 chloric acid, and k 2 is the rate of hydrolysis by M/2 urea 

 hydrochloride. 



Table VIII. 



< 104 h 



h 



•672 

 •650 

 •583 

 •494 

 •303 



As in the case of sucrose inversion the effect of unhydro- 

 lysed salt was determined, by finding in each of the above 

 mixtures the rate of hydrolysis by N/2 (HOI + NaOl), the 

 amount of sodium chloride taken in each case being the 

 approximate amount of unhydrolysed urea hydrochloride 

 found above. The ratio of this number to the corresponding 

 value of ?C2 is taken as the correcting factor for each 

 solution, and by multiplying —^ by this factor the value of 



h, the degree of hydrolysis, is obtained. These results are 

 given in Table IX. Under H are given the values of the 



hydrolysis constants of urea hydrochloride calculated from 



h 2 



the equation H = — =-^— where v is the volume in litres 



(1 - h) v 



containing one gram molecule of urea hydrochloride and in 



this case equals 2. 



Table IX. 



Acetone % (vol.) ^- factor h H 



-672 1-03 -692 -777 



20 -650 1-04 -676 -705 



40 -583 1-06 -618 -505 



60 -494 1-06 -523 -285 



80 -303 1-08 -328 -08a 



