of certain Chemical Actions, etc. 



271 



in water at 90° C. and as quickly as possible introduced into 

 the conductivity vessel. The initial resistance was obtained by 

 plotting a curve for the first few values of the resistance observed 

 and producing it backwards to the resistance axis. There is of 

 course some uncertainty in the early values of the resistance as 

 the solution at first is probably at a temperature slightly below 

 90° C. 



Time in hours 



Observed 

 Resistance 



Change of 



Conductivity 



x 10 6 



fcxio 4 



•80 



357-0 



101 



31 



2-7 



323-5 



391 



36 



3-1 



310-5 



520 



42-2 



5-6 



278-0 



897 



41-2 



6-6 



266-5 



1052 



41-0 



22-2 



174-6 



3080 



38 W 



27-2 



152-4 



3862 



40-1 



29-4 



146-10 



4144 



40-4 



45-6 



114-20 



6055 



40-8 



52-2 



105-35 



6793 



41-3 



71 



88-44 



8600 



41-9 



75-8 



85-50 



9000 



41-8 



101-2 



73-53 



10920 



41-1 



124-1 



67-27 



12100 



40-5 



144-3 



63-91 



13100 



42-2 



166 



59-71 



14000 



430 



190-4 



57-38 



14730 



42-4 



220-5 



55-11 



15440 



43-1 



239-9 



54-16 



15760 



43-2 



265-8 



53-14 



16120 



43-2 



287 



52-59 



16320 



42-6 



336 



51-81 



16600 



40-8( 2 ) 



364 



51-68 



16650 



39 -9 ( 2 > 



404-3 



50-70 



17020 



42-7 



( x > The temperature when this reading was taken had fallen to 88° C. 



P) Towards the end of the experiment a bubble of gas had formed in the resist- 

 ance vessel and this made the resistance for these two readings too high. This 

 bubble was got rid of before the last reading. 



The value of k deduced from these experiments is 42-5 x 10~ 4 . 



