921 



Öfversigt af Kongl. Vetenskaps-Akademiens Förhandlingar 1899. N:o 9. 



Stockholm. 



On the temperature Co-efficient of Ester-saponification. 

 By T. Slater Price. Ph. D. B. Se. 



(Communieated 1899, November 8 by O. Pettersson.) 



The saponification of an Ester by means of an acid is 

 known to take place according to an equation of the first degree, 

 i. e. the actual process is represented by the equation 



where ä; is a constant, A the concentration of the ester at the 

 conimencement of the reaction and a the quantity saponified at 

 the ti me t. 



Hemptinne (Zeit. f. Phys. Chemie 13. 561) and Löwen- 

 herz (Zeit. f. Phys. Chemie. 15. 389) have investigated the value 

 of the constant k for diiferent esters, in order to find out the 

 influence on it of the acid and alcohol radicles respectively. 

 The experiments of Hemptinne were carried out at 25" C. and 

 those of Löwenherz at 40' C, and comparison between the two 

 was made by assuming that the temperature co-efficient was the 

 same for all the esters and then calculating the constants at 

 25" from those at 40' according to the usual formula 



