ÖFVERSIGT AF K. VETENSK.-AKAD. FÖRHANDLINGAR 1899, N:0 9. 931 



According to Arrhenius (Zeit. f. Phys. Cheni. 4. 226) the 

 equation connectiiig the value of the velocity constant with the 

 temperature is 



Oj j -. Jx 



vvhere Ä = constant = half the heat required to transforin the 

 inactive form into the active. 



2'= absolute temperature. 

 Integrating this we have 



Ink = — TP, + B 



where B is the integration constant. 



This equation gives correct results in most cases to which 

 it has been applied, and we must therefore assume that the heat 

 of transformation of the inactive into the active form is inde- 

 pendent of the temperature. Where however this heat of trans- 

 formation varies with the temperature the equation takes the 

 form given to it by Van't Hoff, viz. 



d A ' 



—^lnk=:-^^ + C 



or more generally the form 



clT ~ RT' 



(Cf. Bodenstein, Zeit. f. Phys. Chem. 29. 298). 

 Using the forumla of Arrhenius we have 



lnk = — yp + B . 



For Metliyl Acetate, calculating the constants A and B, accord- 

 ing to the method of least Squares, we find, using logarithms to 



base 10 



^ = 3762. 5 = 9.46642. 



The agreement of calculating with experiment is shewn in 

 the followincf table. 



