Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
Hydriodic Acid
This is a compound of iodine and hydrogen. In gaseous form it is colorless, fumes in the air, and is very soluble in water. In liquid form, when strong, it is very liable to change, and should cohol, very deliquescent, and corrosive. To be kept in well stoppered bottles. In combi- obtain it, evaporate solution of potassa rapidnation with bases it forms HYDRIODATES. ly in an iron vessel over the fire until ebulli- The hydriodates may be easily formed by tion ceases and the potassa melts. Pour this saturating the acid with the oxides or hydrates of the bases, or more economically, by acting on the bases in water, with iodine. When the hydriodates are deprived of their water, they are true IODIDES; that is, simple combinations with iodine. (See No. 3853.)