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Hazard Predictions

• Corrosive: Reaction products may be corrosive
• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive
• Toxic: Reaction products may be toxic

In aqueous solution, hypochlorite salts (including the common bleaching agents sodium hypochlorite and calcium hypochlorite) are in a pH-dependent equilibrium with dissolved chlorine gas. Under basic (high pH) conditions, the equilibrium favors the hypochlorite ion, but under acidic conditions, the equilibrium is shifted strongly toward chlorine gas, which can evaporate out of solution under certain conditions and cause a severe inhalation hazard. The accidental mixing of sodium hypochlorite bleach with acidic cleaning agents, and the subsequent rapid generation of chlorine gas, has resulted in serious injuries and death. This has occurred even with weak acids.

Potential Gas Byproducts

• Chlorine (Cl2)