| 1 | The method of purifying hydrogen chloride is introduced. | |
| 2 | Anhydrous hydrogen chloride is considered non-corrosive. | |
| 3 | Systems that use hydrogen chloride must be kept extremely dry. | |
| 4 | The fuming is a result of hydrogen chloride's reaction with moisture in the air. | |
| 5 | Residual or process hydrogen chloride within the system should be disposed of using a caustic scrubber. |