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Hazard Predictions

• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Unstable when heated: Reaction products may be unstable above ambient temperatures
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive

The presence of moisture affects the stability of diazonium salts. A moist product, if allowed to stand packed together, may undergo spontaneous decomposition. In damp weather, when spread out on paper, the salts become dark and slowly decompose (Organic Syntheses, Vol. 13, p. 46 (1933)).