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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)
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive

Contact with anhydrous liquid HF causes CaO to incandesce (Mellor, J.W. 1956. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 2, Supp. 1, p. 122. Longmans, Green and Co Ltd.; Mellor, J.W. 1939. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 9, p. 101. Longmans, Green and Co Ltd.).

HCl and HF react violently with NaOH or ammonia (Lewis, R.J., Sr. 1992. Sax's Dangerous Properties of Industrial Materials, 8th Edition. New York: Van Nostrand Reinhold. pp. 1893, 1897).

Reactions between acids and KOH can be violent (MCA Case History No. 920, Case Histories of Accidents in the Chemical Industry, Washington, Manufacturing Chemists' Association).

Inorganic acids may react with bases to liberate acid and base fumes.

Potential Gas Byproducts

• Acid Fumes
• Base Fumes