( 623 ) 
A. Ewperiments with saccharose. 
4, Pure sugar candy was dissolved in water '), precipitated with 
aleohol (96 vol. proc.), washed with ether and then dried in vacuo 2). 
The ethyl acetate used in these and subsequent experiments was 
thrice redistilled and afterwards a N./,, solution was made of it. 
I investigated the influence of N./;, N./1o, N-/o, N/,o and N./sp 
sugar solutions on the saponification-velocity. These were prepared 
by means of N./2!/, stock solution which was preserved with camphor 
to prevent fungoid growth. In these as in all subsequent experiments 
the solutions were always prepared quite independently of each other 
whilst for each solution the velocity-constant was determined 5 
(or more) times. The mean of the two series thus obtained will 
be taken as the end: figure.. 
When calculating the constant (£), the concentration at the first 
observation was considered as the initial concentration, so that the 
influence of the first errors becomes trifling. The constant follows 
from the equation *): 
= Cy TE 
Gy Cn (tn — ti) 
Before giving the results obtained on saponifying solutions to 
which saccharose had been added, I will first give some determinations 
made with purely aqueous selutions. 
In all the following tables, ¢ represents the time required for 
saponification in minutes, C, the concentration cf the lye (expressed 
in N./so NaOH); the third column contains the value & C,. 
KAGH LE ‚BIE 
N./o ethyl acetate + N./,, NaOH. 
k 
First series. Second series 
t Cu kC, t Cn kC, 
2 7.29 aan 2 7.20 —-— 
4 5.82 0.126 dL 5.75 0.126 
6 4.90 0.122 k=6,85 6 4.81 0.124 
8 4.18 0.124 9 3.90 0.121 k=688 
10 3.63 0.126 12 3.18 0.126 
12 3.23 0.125 15 2.73 0.123 
average 0.125 average 0.124 
1) The water used in the experiments was distilled with particular, care and freed 
from carbon dioxide by passing a current of air (free from CO,) for 6 hours. 
2) See KE. O. von Lippmann, die Chemie der Zuckerarten (1895), S, 59. 
3) See van “t Horr-Conen, Studien zur chemischen Dynamik (1896), S. 13; 
ARRHENIUS, Zeitschrift fiir phys, Chemie 1. 112 (1887). 
45 
Proceedings Royal Acad, Amsterdam. Vol LI. 
