| The waste contains chemicals such as lye, red phosphorus, hydriodic acid and iodine. |
| In this way, by adding phosphorus to the reaction mixture, hydrogen iodide is recycled and the reducing efficiency of hydriodic acid is enhanced. |
| The most widely-used method of manufacturing the drug involves heating pseudoephedrine or ephedrine, red phosphorus and hydriodic acid. |
| By dissolving the carbonate in hydriodic acid and evaporating the filtered liquid in vacuo or out of contact with air. |
| When heated to 300 C. with hydriodic acid and hydrochloric acid, in the presence of some red phosphorus, it yields benzoic acid. |
| In this process the sulphuretted hydrogen converts the iodine into hydriodic acid, whilst sulphur is liberated. |
