SOAPS FOR ABSOKPTION OF BliUMlXl': VAl'OU. — -CUEUiUTON'. 121 



passed through tlic iil^sorption tube at tlie rate of four Inibhlcs 

 per seeond, "(lold Dust" was found to absorb about one- 

 half its weiglit of l)r()Hiine; whereas it was found to al)sorb 

 0.883 times its weiglit of the gas, when the rate was reduced 

 to two bubbles per second. In some cases it was found that 

 a sample of soap, which had become saturated with bromine, 

 was capable of absorbing a further quanity of the gas after 

 being allowed to stand for a time. For instance, a certain 

 sample of "Castile" soap which had absorbed 0.75 times 

 its weight of bromine was found, after an interval of eighteen 

 hours, during which period it had remained in the U-tube, 

 to be capable of taking up a further quantity of bromin?, 

 the weight absorbed increasing to 0.9G-4 times the weight 

 of the soap. Further, it was found that the amount of 

 bromine absorbed by different soaps is influenced by the 

 amount of moisture which they contain. Thus, a freshly 

 ground, brown laundry soap, containing a high percentage 

 of sodium oleate and some sodium resinate, was found to 

 absorb 0.983 times its weight of bromine. When the same 

 soap had been dried, it was only able to take up 0.515 times 

 its weight of bromine. 



Below is given the maximum weight of bromine absorbed 

 by unit weight of soda lime and a number of different soaps, 

 when air saturated with bromine was passed through the 

 absorption tube at the rate of two bubbles per second: 



Soda lime 0.477 gram 



"Ivory" soap 0.48 " 



"Santo" soap 0.607 " 



"Olivette Castile" soap 0.631 " 



"Gold Dust" 0.883 " 



"White Castile" soap 0.964 " 



"Oleate" soap (a brown laundry soap) 0.983 " 



Pure sodium resinate 1.068 " 



Pure sodium oleate 1.113 " 



