Mr. J. J. Hood on the Laws of Chemical Change, 375 

 Temperature 16° C. 



Permanganate, in cubic 

 centime. 



Time, in \ 



ninutes. 



Found. 



Calculated. 



Found. 



Calculated. 



10 











870 





20 





7-67 



7-69 



40 



40-7 



6-80 



6-79 



63 



63 



5-57 



5-58 



106 



106-4 



4-87 



4-84 



1424 



141 



4-43 



440 



170 



168-3 



3-82 



381 



217 



216-5 



3-50 



350 



248-5 



248-6 



3-26 



3-24 



279 



276-7 



301 



302 



309-5 



310-8 



2-84 



2-81 



342 



337-4 



2-49 



2-47 



406 



403-7 



206 



204 



520-5 



515-9 



1-80 



1-75 



628 



609-7 



177 



1-73 



639 



622-3 



Experiment 2. — The solutions employed were 50 cubic 

 centims. ferrous sulphate (equal to # 98i7 grm. Fe), 10 cubic 

 centims. potassic chlorate containing '3593 grm. KC10 3 , and 

 400 cubic centims. water : total volume 460 cubic centims. 

 The following Table contains the results of this experiment. 

 Taking the second and third observations for the constants a 

 and b, the equation is 



y(222-8 + 0=2512-1. 

 Temperature 18° C. 



Permanganate, in cubic 

 centims. 



Time, in minutes. 



Found. 



Calculated. 



Found. 



Calculated. 



1121 



1127 







1-3 



1110 





3-5 





9-82 





33 





8-48 



8-52 



72 



73-3 



7-56 



7-59 



108 



109-5 



6-76 



6-72 



151 



148-8 



6-54 



6-54 



161 



161-3 



5-96 



5-95 



199-3 



198-7 



563 



5-65 



222 



223-4 



5-32 



5-30 



251 



249-4 



4-98 



4-96 



283 



281-6 



4-68 



4-68 



315 



314 



4-34 



4-33 



357 



356 



412 



411 



388 



386-9 



3-95 



3-92 



418 



4131 



3-76 



3-70 



455 



445-3 



3-69 



3-67 



461 



458 



3-42 



3-40 



515 



511-7 



3-22 



321 



560 



557-4 



303 



2-99 



617 



606-3 



2-94 



292 



638 



631-6 



263 



261 



739 



732-4 



2-34 



2-30 



869 



851 



213 



2-10 



972 



957 



