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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)
• Unstable when heated: Reaction products may be unstable above ambient temperatures

Most interactions between less reactive metals and weak acids are slow at room temperature. However, hazardous products are formed in some cases.

Sulfurous acid reacts rapidly with tin (Gaver, C. C. and Updated by Staff 2005. Tin and Tin Alloys. Kirk-Othmer Encyclopedia of Chemical Technology. (Online)).

Phosphoric acid reacts slowly with tin (Gaver, C. C. and Updated by Staff 2005. Tin and Tin Alloys. Kirk-Othmer Encyclopedia of Chemical Technology. (Online)).

Formic acid is decomposed by palladium/carbon catalysts, releasing flammable H2 gas (Freifelder, M., 1971, Practical Catalytic Hydrogenation, New York, Wiley-Interscience, pp. 188).

Reaction of silver and oxalic acid forms unstable silver oxalate, which can explosively decompose into CO2 gas at elevated temperatures (Urben, P.G. 1995. Bretherick's Handbook of Reactive Chemical Hazards, 5th Edition. Oxford: Butterworth-Heinemann. pp. 3).

Organic acids such as lactic, citric, tartaric, and oxalic acids attack tin slowly in the presence of air or oxidizing substances. When not in the presence of air, however, they do not react with tin (Gaver, C. C. and Updated by Staff 2005. Tin and Tin Alloys. Kirk-Othmer Encyclopedia of Chemical Technology. (Online); Graf, G. G. 2000. Tin, Tin Alloys, and Tin Compounds. Ullmann's Encyclopedia of Industrial Chemistry. (Online)).

Boiling HF reacts with all metals except platinum (Aigueperse, J. 2002. Fluorine Compounds, Inorganic. In Ullmann's Encyclopedia of Industrial Chemistry. Wiley-VCH Verlag GmbH & Co. KGaA. (Online)).

Potential Gas Byproducts

• Carbon Dioxide (CO2)
• Hydrogen (H2)