HYDROLYSIS OF UREA HYDROCHLORIDE. 127 



Table I. 

 10 per cent, sucrose, N/2 hydrochloric acid and M/2 urea in 70 

 per cent, alcohol. Temperature 25° C. 



t 

 



58:0 



k 



30 



53-3 



•00100 



50 



50-2 



•00102 



70 



47-5 



•00100 



100 



43-0 



•00104 



138 



37-8 



•00106 



180 



33-4 



•00104 



210 



30-4 



•00103 



240 



27-5 



•00103 



270 



24-8 



•00103 



288 



23-5 



•00102 



00 



-12-2 



II 9 



mean -00103 



In Table II are given under ki the mean values obtained 

 for the rate of inversion of 10 per cent, sucrose by N/2 

 hydrochloric acid. Under Jc 2 the rate of inversion by M/2 

 urea hydrochloride and under -^ the ratio for the different 







fci 







er-alcohol mixtures at 25° 



O. 









Table 



II. 







Alcohol % (vol.) 



h 





k 2 



k 2 







•00219 





•00143 



•653 



40 



•00192 





•00112 



•583 



50 



•00177 





•00103 



•579 



60 



•00185 





•00101 



•543 



70 



•00200 





•00103 



•515 



The ratio redoes not represent the true degree of hydro- 



/Ci 



lysis of the urea hydrochloride. As pointed out by Walker 

 and Wood (Zoc. cit.), the inversion velocity is influenced by 

 the presence of unhydrolysed salt. The latter affects the 



