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.
Home › Acids › To Obtain Hydriodic Acid
To Obtain Hydriodic Acid
Pour a little water over some periodide of phosphorus, previously put into a small glass retort, and apply a gentle heat, when gaseous hydriodic acid will be evolved, and phosphoric acid remain behind. The gas may be either collected over mercury or passed into water, when liquid hydriodic acid will be formed.
Or: Place iodide of barium in a retort, and decompose it with sulphuric acid, when pure hydriodic acid will be evolved. into suitable moulds, and, when cold, put it into stoppered bottles.