230 Cc. W. R. POWELL. 
The acid concentrations so far employed wereall sufficient. 
to prevent the separation of manganese peroxide. In some 
of the following experiments, however, manganese peroxide 
was precipitated, but the results are nevertheless inter- 
esting since they indicate the direction in which the reac- 
tion tends to go at lower acid concentrations. 
11. Temperature 15° C, Sulphuric acid -15 N. 
t n x (a-x) (b-2x) fe: ky 
aes (o> og 0731 ‘O113 She ah 
17 v3 ‘0001 0730 °0112 0005 -00000072 
51 9-2 :0017 -0714 "0096 0032 -00000442 
60 9-9 0023 "0708 -0090 0037 ~=:00000527 
74.) 11°93. =:0035 "0696 ‘0078 0049 -00000703 
81 12-4 "0044 ‘0687 ‘0069 0061 -00000859 
92 »13°6 -0054 ‘0677 °0059 -0070 -0000100 
101. 14:8 ‘0064 -0667 "0049 0083 =-0000119 
oo 20°6 ‘O11S ‘0618 
12. Temperature 15° C. Sulphuric acid 058 N. 
t n x (a—x) (b-2x) k, k, 
ey 6-2 - ‘OF ot “0113 a < 
Me 2 -0009 “0722 -0104 0030 -00000457 
50 (ee -0013 ‘0718 ‘0100 0025 -00000337 
74 9-] -0022 ‘0709 ‘0091 0030 +00000406 
92. 10:3 ‘0032 “0699 ‘0081 "0035 -00000496 
106. i1:2 "0039 “0692 ‘0074 0040 -00000562 
PYG pokes -0050 ‘0681 -0063 "0045. . 00000712 
oc 20°8 “0113 ‘0618 
The reaction between sucrose and potassium permangan- 
ate is very complex, as indicated by the variety of products 
obtained, and it is very probable that the number of sub- 
Sidiary reactions increases as the reaction proceeds. In 
any case, their influence on the velocity of reaction would 
gradually become more marked owing to the gradual 
decrease in the concentration of sucrose and potassium 
permanganate, and for this reason the velocities for different 
acid concentrations were compared at a stage as near to 
the commencement of the reaction as was possible. 
