924 PRICE, ON ESTER-SAPONIFICATION. 



as the latter is independent of the conceiitration in a reaction 

 of the first order. 



In every case the end titre was taken and the constants 

 calculated from the first titration as starting point. 



We have 



or ■ , 



kdt 



A — X 



.' . — loge (-4 — x) =^ kt + const. 

 Starting from the first titration at the time ^^ we have 



X ^= Xq when t = t^ 



. • . — log (^ — Xq) — kt^ + const. 



. • . const. = — log (^ — x^ — kt(^ 



. • . log {A — x^) — log {A — x) = k{t — g 



.-. k = los. 



Instead of the calculations being made with natural logarithms 

 they have been made with Briggs' logarithms. This will not 

 afFect the result however, as the absolute values of the constants 

 are not required, bat only relative ones for the sake of comparison. 

 In the following tables 

 t = time in rainutes. 



X = titre in ccs of Baryta (inean of two experiments). 

 oo = end titre. 

 k = constant calculated according to the above equation. 



Methyl Aeetate. 



n 

 Strength of Acid (HCl) in reaction mixture — -r . 



n 

 » » Ester » » » =: — . 



b 



(A normal j — l Solution = molecular weight in grams of the 

 substance, dissolved in 1000 ccs of water.) 



