355 



In this A represents the glycerine, which can be converted to 

 monoglyceride B with a -'velocity constant" k„ and into diglyceride 

 C with" a "velocity constant" pk,. Either of these can be converted 

 into triglyceride D with the given "constants of velocity". 



When we now determine the equations of velocity, then /> and ^, 

 occur in them, which are both variable: 



ds ,. , 



dt 



dt 



dt 



dr , , 



--- = k,.x-{-pk,.y. 

 dt 



We may, however, put p and l\ constant during a short period 

 from the beginning of the reaction, and ascertain the form of 

 ƒ((/, 7') = at the end of this short period. 



As was already discussed before, k, does not occur in this last 

 function, from which follows that ƒ (^, 2') = is independent of 

 the value and of the variations of k,. It is now, however, the 

 question whether the factor p can likewise be eliminated, or whether 

 it remains in the equation. In the former case /{<./, T) = -is also 

 independent of p, in the latter case it is not. It is, of course, directly 

 to be seen that the factor p will certainly have influence, and can, 

 therefore, not be eliminated. 



This, however, causes the relation holding at the end of the short 

 period that p is considered constant, to change if the reaction progresses. 

 From this results that the found f(g, T) = does not hold through- 

 out the course of the reaction, but only represents a curve which 

 may be serviceable as an orientation whether y> T' is possible at 



the supposition made. 



Moreover when equilibrium comes near, the reaction in opposite 

 sense begins to exert more and more influence. In view of the fact 

 that the sulphates considered are esterized to glycerides, but are not 

 restored to their original form by the opposite reaction, it is clear 

 that at last the same equilibrium is reached as in the saponification 



of triglyceride. 



It is therefore, now the question: is there an initial value of p 

 to be found by means of which the curve B found experimentally 

 is to be explained. 



