378 Action of Heat on Potassic Chlorate and Perchlorate. 



Table II., of the corresponding values of n. The relation 

 required for this purpose is 



KCIO3 rc-1 



px 



or 



KOI " 

 4*2860 p = n. 



Table III. 



Number of 

 Experiment. 



p. 



(Chloride 



-=- chlorate.) 



p calc. 



n. 



5. 

 6. 



7. 



1-5630 

 1-5781 

 6-8442 



1-3847 

 1-3836 

 3-7261 



5-9348 

 5-9300 

 15-970 



There is a fair agreement in comparisons 5 and 6. The 

 discrepancy in 7 arises in great part from the fact that the 

 form of the function renders it difficult to deduce accurately 

 such high values of n as 15*970 from experiments of not 

 exceptional accuracy. If, for example, w = 30, r — 1*1275, 

 which differs very little indeed from r — 1*1287, when n— 

 15*970 r. It is probable also that the chlorate (never actually 

 exceeding more than about 4 per cent, of the perchlorate) 

 was decidedly underestimated. Additional experiments on 

 this subject are much to be desired. 



Equal Weight Relations. 



It is usual in chemical change for a critical relation to be 

 established when certain of the reagents are present in equal 

 weights. Thus, in the chlorate reaction, if the ratio of 

 chloride to oxygen be that of equality in weight, r=l; and 

 the equation 



-1 



•42867 r 



n-2 



then gives n= '24970. 



Similarly, in the case of the perchlorate, where 



•42867 r: 



1 



2n-T 



if r = l, w= 4*0048 — i.e. the reciprocal of the previous value 

 of n. It appears then that, subject to the condition indi- 

 cated, the reaction whereby perchlorate is decomposed is the 

 exact inverse of the chlorate reaction. 



