124 



Mr. J. J. Hood on the Laws 



iron solution ('4968 grm. Fe), 10 cubic centims. potassic 

 chlorate solution (*1813 grm. KC10 3 ), and the necessary 

 amount of acid : the total volume in every case was 260 cubic 

 centims. The permanganate used for determining the iron 

 was of such a strength that 10 cubic centims. were equivalent 

 to -0199 grm. Fe. 



The numbers a and b in the Table were calculated by the 

 equation y (a-\-t)=b, where y is the number of cubic centims. 

 of the permanganate required for 10 cubic centims. of the ex- 

 perimental solutions, a!b f are the values for the blanks or 

 when 5 grms. H 2 S0 4 were used. The ratios are those of the 



means and the acid ; that of — gives the value of?/ when £=0. 



Table I. 



Temp. 

 C. 





b. 



Means. 



Amount 

 of 



Ratios. 



a. 







• 













a. 



b. 



H 2 S0 4 . 



a' : a. 



b':b. 



Acid . 













grams. 









13°-8j 



243-5 

 249-4 

 129-8 

 128-3 



2243-8 

 2294-7 

 1169-8 

 1157-5 



246-4 

 129 



2269-2 

 1163-6 



5 

 10 



1910 



1-950 



200 



12°-4 j 



282-3 



281-9 



93-4 



96-6 



2598-5 



2600-5 



840-9 



861-5 



282-1 

 95 



2599-5 

 851-2 



5 

 15 



2-969 



3053 



300 



12° -8 j 



279-8 



271-8 



66-7 



66-6 



2554-0 



25118 



580-1 



577-2 



275-8 

 66-6 



2532-9 



578-6 



5 

 20 



4141 



4-377 



400 



12°-9J 



271-9 



270-9 



64-7 



65-5 



2502-2 

 2495-5 



567 



570 



271-4 

 65-1 



2498-8 

 568-5 



5 

 20 



4-169- 



4-395 



400 



13°-1 J 



265-5 



265-6 



47-3 



48-1 



2448-9 

 24504 



400 



405-3 



265-5 



47.7 



2449-6 

 402-6 



5 



25 



5-566 



6084 



500 



ll°-4 



3032 



307-5 



42-6 



42-5 



2809-3 



2843-9 



355-7 



352-2 



305-3 

 42-5 



2826-6 

 3539 



5 



30 



7-183 



7-987 



6-00 



13° j 



267-5 

 2717 



23-8 



23 



2485-2 



2523-2 



174-7 



173-9 



269-6 

 23-4 



2504-2 

 1743 



5 

 40 



11-521 



14-367 



8-00 



13° -9 



2445 



243-7 



159 



17-2 



2255 



2262 

 100-7 

 108-5 



2441 

 16-5 



2258-5 

 104-6 



5 



50 



14793 



21-591 



1000 



