The only acid capable of dissolving glass
In short: While most acids are kept in glass containers, one specific halogen reaction creates a substance so corrosive it eats through the bottle itself. This video explores the unique chemical properties and industrial applications of the halogen group.
The halogen group (Group 7) includes elements like fluorine, chlorine, and iodine, each with distinct reactive profiles. For example, chlorine reacts with sodium hydroxide to create a mixture used widely as industrial bleach. However, fluorine's reactions are notably more volatile. When fluorine reacts to form hydrofluoric acid, it creates a substance that can dissolve silicon dioxide—the primary component of glass. Because it forces this usually inert material to react into silicon tetrafluoride and water, the acid must be stored in specific resistant plastics. Beyond its dangers, this property is exploited industrially to 'etch' patterns into glass surfaces.
Other halogens serve practical roles in detection: iodine is used to identify starch. This chemical property is used to detect counterfeit banknotes, as official currency paper is starch-free, while standard paper will turn blue when treated with the iodine.
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Sources
- Summary by Intellect · source: What Are The Reactions Of Halogens | Reactions | Chemistry | FuseSchool
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