332 CONTRIBUTION TO STUDY OF HYDROXYLAMINE. — MACKAY. 



ature the measurements were made. When the electrodes were 

 dry they were connected in the circuit and suspended immedi- 

 ately over the solution in the cell for about ten minutes, when 

 they were dropped carefully into the liquid and a reading made 

 as quickly as possi ble, the time taken being about half a minute. 

 After the lapse of about 6 minutes another reading was 

 taken, the change in conductivity being as follows : — 



strength of Molecular Conductivity 



Solution. Conductivity. after 6 minutes. 



N/5 098 11 



N/10 -28 -32 



N/20 -40 -43 



N/50 -52 -55 



N/100 -76 -86 



N/200 1-3 1-80 



N/500 1-4 1-85 



It thus appears that greater relative decomposition takes 

 place in dilute solution. This may be due, however, to the fact 

 that in concentrated solutions minute bubbles of gas adhere to 

 the electrodes keeping the resistance higher until dislodged by 

 shaking. 



The conductivity of the pure hydroxylamine, owing to the 

 small amount of material available, had to be determined in a 

 very small cell of about 6cc. capacity. It was made by ham- 

 mering out into thin plate the ends of two tin wires, and passing 

 them through a piece of paraffin, which served as a stopper to 

 the cell. The wires were filed to thin diameter where the top 

 of the solution would come into contact with then), and a 

 diamond scratch was run around the outside of the ceU so that 

 the same amount of solution could always be added. The cell 

 itself was merel}^ a weighing tube, and the hydroxylamine was 

 collected in it directly from the condenser. 



For the measurement of the conductivity of water, a cell of 

 the Arrhenius type was used with electrodes platinised accord- 

 ing to the formula of Luramer & Kurlbaum.^ 



1, Wied. Ann., 60, 315, (1897) 



