380 



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

 Temperature 18° C. w=3. 



Permanganate, in 

 cubic centims. 



Time in minutes. 



Found. 



Found. 



Calculated. 



975 

 7-20 

 5-23 

 3-73 

 286 

 2-06 

 1-46 

 115 

 •85 

 •61 





 24 



50-3 

 81-8 

 106 

 139-3 

 172-8 

 1995 

 231 

 264 



51-4 

 82-5 

 1081 

 140-8 

 172-6 

 201-3 

 233-5 

 269-4 



Experiment (7). — The ratio of the potassic chlorate to the 

 iron was as 4:1, or n = 4 ; and A was found by experiment to 

 be 9*78 cubic centims. Using the first and third observation 

 for a and C, we get 



Temperature 17°*8 C. rc=4. 



Permanganate in 

 cubic centims. 



Time, in minutes. 



Found. 



Found. 



Calculated. 



9-56 

 8-36 

 7-26 

 6-38 

 5-56 

 4-86 

 4-32 

 3-86 

 307 

 2-68 

 2-22 

 1-98 

 171 

 1-35 

 1-30 

 11 

 •85 





 25-7 

 497 

 751 



104 



128-3 



1525 



175 



217-5 



249 



293-5 



317-5 



346-5 



402 



410-5 



447-5 



508 



23-8 



74 



100-5 

 127 

 1507 

 173-6 

 221 1 

 249-8 

 290-2 

 315 

 346-9 

 3991 

 4074 

 444-7 

 502-6 



Experiment (8). — In this case there was an excess of iron 

 present, which alters the form of the equation on account 

 of n being less than unity, the ratio of iron to potassic chlo- 

 rate being as 1 : *8, or n = *8; A was found to be 9*40 cubic 

 centims. Taking the second and third observations for C, 



