Why should acids never be added to chlorine solutions?

Chlorine solutions, when mixed with acids, lead to the release of chlorine gas, which can be extremely hazardous. This reaction occurs because the acid protonates the chlorine molecules, causing unstable intermediates to form that decompose and release chlorine gas. This gas is toxic and poses significant health risks, including respiratory distress and other severe health effects.

While it's valid that such mixtures can also lead to violent reactions or produce harmful byproducts, the primary concern is the immediate and dangerous release of chlorine gas, which can occur rapidly and requires strict safety precautions to prevent exposure. Understanding this reaction highlights the importance of proper handling and mixing protocols in environmental compliance and safety practices.