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Hazard Predictions

• Corrosive: Reaction products may be corrosive
• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Unstable when heated: Reaction products may be unstable above ambient temperatures
• Toxic: Reaction products may be toxic

Nitrites can react with acids to form unstable nitrous acid, which decomposes into toxic nitric oxide (NO) and nitrogen dioxide (NO2) gases unless it is kept cold and very dilute (Housecroft, C. E.; Sharpe, A. G. Inorganic Chemistry, 2nd ed.; Pearson: Harlow (England), 2005, p. 415). This reaction contributed to an industrial accident where a mixture of nickel nitrate and phosphoric acid was inadvertently added to a tank containing sodium nitrite, and within minutes a large quantity of toxic nitrogen oxide gases was produced that required the evacuation of the plant (National Transportation Safety Board Hazardous Materials Accident Brief No. DCA99MZ003, HZB/00/02, 1998).

Exothermic oxidation of metals is possible if the nitrate salt contains a redox-active cation (transition metal or ammonium), with the release of NOx gases. (Predicted). 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.

Potential Gas Byproducts

• Nitrogen Oxides (NOx)