228 Cc. W. R. POWELL. 
From this table it may be seen that on halving a, t was 
found to double; on halving b, t did not alter, while on 
halving both a and b, t again doubled: the combined results 
justifying the designations of the reaction as one of the 
second order. 
The influence of sulphuric acid on the reaction. 
In preliminary experiments it was found that the con- 
centration of sulphuric acid in the solution had a consider- 
able influence on the rate of reaction. A series of experi- 
ments was therefore carried out in which the concentration 
of the acid was varied from 1°16 normal to 0°058 normal. 
Determinations were made at 5° ©. and 15° OC. and the 
sucrose waS maintained in considerable excess in order 
to minimise the influence of subsidiary reactions. The 
concentration of sucrose and potassium permanganate: 
remained constant throughout the series. 
Sucrose (a) °0731 N. Potassium Permanganate (b) °0113 N.. 
5. Temperature 5° C. Sulphuric acid ‘29 N. 
t n xv (a—x) (b-«a) k, k, 
ae 6°2 mn 0731 0113 us i 
53 (ie ‘(0007 = 0724 = 0106=— 0012 +=-0000017 
70 82 ‘0016 ‘0715 . -0097 . -0021 =B0GGGa0 
84 8-6 ‘0019 ‘0712 +0094  -0022  -000G0a5G; 
105 9-3 -:0024 ‘O707 ~=:0089 = 0023 ~—_ -0000032 
129° (10-7 |} 70055... 0636 ‘0078 -0029 -0000043. 
oe BOT 9 11S |» 061s 
6. Temperature 5° C. Sulphuric acid ‘58 N, 
t n i (a-x) (b-2x) k, k, 
ai 6:1 je "0731 °0113 ate Bs 
35 68 0005 -0726 £-0108  .-0015-——=00600Ts 
45 73 =6°0009—s- -0722—s ©0104 «= 0018 0000075 
60 86 0019 -0712 £-0094  -0030 “0000025 
70 102 :0030 -070i1 #-0083  -0045 00000iz 
83. 116 |':0041 0690 ‘0072 -0054 , 0000077 
3°4 
oF ist "0054 = -0677 0059 =:0067 0000096. 
110 144 -:0061 "(0670 =:0052 0071 -0000102 
123 163 -0075 -0656 -0038 #-0089 -0000129 
oe 218 “O1ts >06i8 
