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Hazard Predictions

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

In most cases, there is little to no reaction between strong non-oxidizing acids and noble metals. However, there are some exceptions:

Palladium is rapidly attacked by concentrated HBr and HI at room temperature (Seymour, R. J. and O'Farrelly, J. I. 2001. Platinum-Group Metals. Kirk-Othmer Encyclopedia of Chemical Technology. (Online)).

HCl, HBr, and HI react with copper at ambient temperatures, especially when in contact with air. Flammable hydrogen gas is produced (Mellor, J.W. 1923. Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Vol. 3, p. 81. Longmans, Green and Co Ltd).

The halogen acids attack tin, particularly when hot and concentrated (Gaver, C. C. and Updated by Staff 2005. Tin and Tin Alloys. Kirk-Othmer Encyclopedia of Chemical Technology. (Online)).

Mercury is little affected by hydrochloric acid (DeVito, S. C. and Brooks, W. E. 2005. Mercury. Kirk-Othmer Encyclopedia of Chemical Technology. (Online)).

Potential Gas Byproducts

• Hydrogen (H2)