and Observations on Iodine, 
4S9 
muriatic acid, there is an effervescence, the smell of chlorine 
is perceived, the fluid becomes yellow, and when evaporated 
yields the chlorionic acid. 
When the solution of the hydroionic acid in water is poured 
upon the triple salt, iodine is instantly produced in great 
quantities. 
Acetic and oxalic acids dissolve the triple compound without 
decomposing it. On heating the solution in oxalic acid, the 
acid becomes brown from the deposition of charcoal, and iodine 
immediately appears. 
When the triple compound is thrown into solution of sul- 
phurous acid, iodine is instantly produced, and sulphuric acid 
formed, and if the sulphurous acid is not in too large a pro- 
portion, the solution becomes yellow by dissolving iodine ; if 
more sulphurous acid is added, water is decomposed, and 
sulphuric acid, and hydroionic acid formed. 
The double compound of potassium and iodine has no action 
on oxalic, acetic, sulphurous, or phosphorous acids, but when 
it is mixed with the triple compound it is instantly decomposed 
by them, and iodine set free. 
The same double compound in its pure state is decomposed 
very slowly by muriatic acid; and to convert the greater 
portion into muriate of potassa ( potassane) it is necessary that 
the acid should be very frequently distilled from it, and a part 
always remains unaltered ; when mixtures of the triple and 
double compounds are exposed to the action of muriatic 
acid, potassane (muriate of potassa) is instantly formed; and 
if the proper proportions are adopted, none of the double or 
triple compounds remain, and the results are potassane only 
and the oxy-chloric acid. 
