932 



PRICE, O.N ESTER-SAPONIFICATION. 



Temp. 



k (obs.). 



k (calc). 



49.95° 



0.006623 



0.006601 



40.00 



0.002778 



0.002795 



27.95 



0.0009185 



0.0009235 



0.05 



0.00004890 



0.00004880 



The calculated values thus agree very closely with the 

 observed values. Of course if calculations are made accurding 

 to the formula of Van't Hoff, one can expect that the agree- 

 raent will be still more marked (if possible), as one more constant 

 is introduced into the equation. 



For Ethyl Acetate we have 



3776. 



B = 9.53839 



Temp. 



k (obs.). 



k (calc). 



49.95^ 



0.006608 



0.006628 



40.00 



0.002817 



0.002814 



27.95 



0.0009232 



0.0009213 



The constants A and B in the above tables have been 

 calculated with Briggs' logarithms; if we calculated them with 

 natural logarithms, we obtain the foUowing results for the 

 different esters. The constant at 40" is also given. 



Ester. 



Value of A. k at 40°. 



Methyl Acetate 



8663 



0.006397 



Aethyl » 



8695 



0.006485 



Propyl » 



8586 



0.006497 



Isobutyl » 



8746 



0.006461 (39.9^ C). 



Methyl Propionate 



8273 



0.006898 (39.9' C). 



Propyl Formate 



7409 



0.01554. 



ARrhbnius (Bihang till K. Svensk. Vet. Akad. Handl. 

 Band 24. Afd. II. N:o 2. p. 16) found A = 8500 for Ethyl 

 Acetate. The agreement between mv results and his must be 



