Mr Wilks, The Absorption of Bromine hy Lime. 527 



10 c.c. Iodine solution (1 c.c. = -01282 I) = 51-85 c.c. "thio." 



Here the concentration of the bromine in the lime increases 



with the increase in concentration in the solution. The third 



G 

 column gives the numbers calculated from the expression ^-^ 



when n is made one-third. These numbers are sensibly constant. 

 This result might be explained either by assuming that the 

 bromine is in solid solution in the lime or that it forms an 

 adsorption compound. On the first hypothesis the bromine in 

 solid solution would be dissolved as a fraction of an atom (assuming 

 that bromine in carbon tetrachloride dissolves as Brj — a most 

 probable assumption since iodine has been shown to dissolve in 

 the same liquid as I^). It seems fairly certain therefore that we 

 are dealing with an adsorption phenomenon. 



In both the above experiments the slaked lime was freshly 

 prepared from pure quicklime and dried in a vacuum desiccator 

 for two days. In the following experiment it was dried for four 

 weeks. 



37-2 c.c. of "thio " = 10 c.c. Iodine solution (1 c.c. = -01282 I). 



