37(> Mr. J. J. Hood on the Laws of Chemical Change. 



Experiments 3 and 4. — Both these experiments were made 

 at the same time and under similar conditions ; each stood 

 five minutes he tore an observation was made. The solution 

 consisted of 25 cuhic centims. ferrous sulphate (equal to 

 •4923 ffrm. iron), 5 cubic centims. potassic chlorate, or -1796 



grin. 



and 200 cubic centims. water. 



Taking the second and third observations for the constants 

 for No. 3, 



?/(103-H- = 967-23, 

 and No. 4, 



y(104-5 + 0= 976,1 - 

 The results are tabulated below. 



Temperature 20° C. No. 



3. 



Permanganate, in cubic 

 centims. 



Time, in 



minutes. 



Found. 



Calculated. 



Found. 



Calculated. 



9-34 



9-38 







•4 



8-60 





94 





677 





398 





5-60 



5-58 



70 



69-6 



470 



4-68 



103-5 



1027 



392 



3-87 



146-5 



143-6 



330 



326 



193-6 



190 



273 



270 



254-5 



2512 



2-34 



2-31 



316 



310-2 



2-04 



2 02 



377 



371 



1-69 



1-66 



479 



469-2 



153 



1-52 



532 



529 



1-28 



1-26 



661 



652-2 





No. 



4. 





Permanganate, in cubic 

 centims. 



Time, in minutes. 



Found. 



Calculated. 



Found. 



Calculated. 



9-30 



9-34 







•4 



819 





147 





6-65 





42-3 





5-46 



5-45 



74-5 



74-2 



4-59 



4-58 



108-5 



1081 



3-84 



3-83 



150 



149-6 



3-24 



3-23 



1975 



1967 



2-67 



2-69 



259 



261 



2-33 



2-31 



318 



314-4 



200 



1-97 



390 



383-5 



167 



1-66 



483 



480 



150 



1-51 



542 



546-2 



125 



1-26 



668 



676-3 



