412 Mr. W. H. Pendlebury and Miss M. Seward. 



But we think there can be no doubt of the truth of the important 

 conclusion we make from these experiments, that in all the mixtures 

 we have made with potassium chlorate and hydrogen chloride (the 

 molecular ratio varying from about 1 : 2 to 1 : 12) there is complete 

 and immediate double decomposition, leaving in the mixture potassium 

 chloride, hydrogen chlorate, and excess of hydrogen chloride ; and 

 that the reaction producing oxidising material takes place between 

 the two acids alone. 



For the facts are briefly these. Corresponding to each mixture 

 of potassium chlorate and hydrogen chloride, we may make a 

 mixture containing of hydrogen chlorate the amount corresponding 

 in molecular weight to the potassium chlorate, and of hydrogen 

 chloride the amount as before less the quantity required to decompose 

 the potassium chlorate. Then the rate in this second mixture will be 

 a little slower than that in the first. If now the amount of potassium 

 chloride corresponding molecularly to the potassium chlorate be 

 taken, divided into a small number of equal quantities, and these 

 added separately to the second mixture, the rate will increase by an 

 equal quantity for each addition (as upon the introduction of any 

 neutral salt), until when all has been added the rate is approximately 

 the same as that of the first mixture. 



The following are further examples of the correspondence between 

 the two sorts of mixtures : 



Table VIII. 



'HC1O 3 = 6 x 51*5 millionth -gram -molecules per c.c. 

 HC1 = 18x65-11-6x51-5. 

 KC1 = 6 x 51-5. 



Rate = 0-0105. 



KC1O 3 = 6x51-5. 



HC1 = 18 x 65-11. 

 L Kate = 0-0104. 



KC1O 3 = 6 x 51-5. 

 HC1 = 15 x 65-11. 



Kate = 0-00554. 



IL<! HC1O 3 = 6 x 51-5. 



HC1 = 15x65-11-6x51-5. 

 KC1 = 6 x 51-5. 



Rate = 0-00555, 

 "KClOg = 2 x 51-5. 

 HC1 = 15 x 65-11. 



Rate = 0-00195. 



HC1O 3 = 2 x 51-5. 



HC1 = 15x65-11-2x51-5. 

 KC1 = 2 x 51-5. 



Rate = 0-00191. 



