Preparation of Hydrogen Iodide
The hydrogen iodide could be obtained by dehydrating hydroiodic acid with phosphorus pentoxide.
The concentrated solution of hydroiodic acid added dropwise to the phosphorus pentoxide. The gas evolved was purified by passing trough a tube filled with phosphorus pentoxide and condensed with liquid nitrogen. Hydrogen iodide was distilled from the solid state and condensed in the receiver as white material.