They are not decomposed by boiling alkalis, but on heating with hydriodic acid they split into their components.
This change can be effected in the laboratory only by heating with hydriodic acid.
The hydriodic acid formed in this way dissolves in the water.
It464 may be obtained colourless by heating the yellow crystals with hydriodic acid and amorphous phosphorus to 240.
In this process the sulphuretted hydrogen converts the iodine into hydriodic acid, whilst sulphur is liberated.
hydriodic acid gas can only be retained a short time over mercury, owing to its action on that metal.
When heated with concentrated hydrobromic or hydriodic acids, it is converted into fumaric acid.
By dissolving the carbonate in hydriodic acid and evaporating the filtered liquid in vacuo or out of contact with air.
The bromide and iodide are formed in a similar manner by heating the metal in gaseous hydrobromic or hydriodic acids.
From malic acid, by fermentation, or by digestion with hydriodic acid in sealed tubes.