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Hazard Predictions

• Corrosive: Reaction products may be corrosive
• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)

Weak acids may cause azo compounds to decompose; N2 gas may be among the products formed (Predicted). The decomposition reaction will be exothermic, and release of gas can cause pressurization. Caution should be used before proceeding. Further research of comparable examples in the literature or very small scale, carefully controlled experiments may be needed to fully assess compatibility. The generation of gases may be rather slow, however confinement may lead to dangerous conditions.

Treatment of aryldiazonium halide salts with hypophosphorus acid (H3PO2) leads to the evolution of nitrogen and HX gases (Loudon, Marc. 2002. Organic Chemistry. 4th ed. New York: Oxford University Press. p. 1096-1097).

Potential Gas Byproducts

• Hydrogen Halide (HX)
• Nitrogen (N2)
• Acid Fumes