1896-97.] On the so-called u Hypoiodite of Magnesium ” 241 
In this as in our other tables for aqueous solutions the numbers 
have been reduced so as to refer to seminormal solutions and 
10 c.c. of caustic soda. It will be noted that the sum of the 
amounts of iodine remaining, absorbed, and transformed into iodide 
and iodate falls somewhat short of the amount originally taken, the 
difference being given in the last column. Special experiments 
pointed to the deficiency, which was always small, arising in the 
titration of the dissolved precipitate ; so that its amount should 
probably be added to the quantity absorbed. In subsequent tables 
this correction has been made, so that in them the “ absorbed 
iodine ” is really the original iodine minus the total quantity found 
in the filtered solution before and after acidification. 
From the figures given above it will be seen that the extent of 
the chemical action is considerable, a comparatively large proportion 
of the iodine being converted into iodide and iodate. In calculat - 
ing the amount of iodine combined with the magnesia to form the 
“ hypoiodite,” it is therefore necessary to subtract the proportion of 
the original magnesia which has passed into solution on account of 
the chemical transformation. Thus, in the above example, of 10 
equivalents of magnesia taken, 1*2 equivalents have been converted 
into soluble salts, so that only 8 ’8 equivalents remain, and these 
have absorbed 1*42 equivalents of iodine. Ten equivalents of mag- 
nesia have therefore absorbed 1*61 equivalents of iodine in the first 
set, and 2*01 equivalents in the second. In the tables which follow, 
this calculation has been performed, and we give the number of 
equivalents of iodine absorbed by 10 equivalents of magnesia, or 
what is the same thing, I 2 in lOMgO. 
A series of experiments was made in which the quantity of iodine 
alone was varied, the time of shaking before filtration being in each 
case ten minutes. 
Volume. 
Iodine taken. 
Iodine 
remaining. 
I 2 in lOMgO. 
Iodine 
transformed. 
30 c.c. 
2‘50 
0'57 
1-31 
0-62 
) 9 
2 "00 
0*22 
1-29 
0-59 
5 9 
1-50 
0-11 
1-02 
0*42 
5 j 
1*00 
0-067 
0-70 
0*25 
YOL. XXI. 5/1/97. Q 
