IOWA ACADEMY OF SCIENCES. 
13 
In the following experiments the hydrobromic acid was 
precipitated as silver bromide which was weighed: 
(1) 20 c.c. bromate solution gave .3753 grams AgBr, 
corresponding to .1596 Br. 
(2) 20 c.c. bromate solution gave .3764 grams AgBr, cor- 
responding to .1603 Br. 
(3) 20 c.c. bromate solution gave .3741 grams AgBr, cor- 
responding to .1593 grams Br. 
(4) 20 c.c. bromate solution gave .3758 grams AgBr, cor- 
responding to .1599 grams Br. 
The theory requires .1599 Br. 
The method described seems to serve equally well for 
chloric, bromic and iodic acids. It is simple and direct, 
requires no specially constructed apparatus and in case one 
determines the hydrochloric, hydrobromic or hydriodic 
acid gravimetrically it requires no standard solutions. 
Iowa College, Grinnell, Iowa, April 15, 1905. 
