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Hazard Predictions

• Corrosive: Reaction products may be corrosive
• 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)
• Toxic: Reaction products may be toxic

PHOSPHORUS PENTASULFIDE may heat and spontaneously ignite in presence of moisture. Reaction with water forms toxic hydrogen sulfide gas and phosphoric acid. Dangerous when wet (Hazardous Chemical Reactions, NFPA 491, Boston, National Fire Protection Association, 1969).

When aqueous solutions of sodium sulfide are exposed to air, they slowly convert to sodium hydroxide and sodium thiosulfate. Crystalline sodium sulfide forms hydrogen sulfide and sodium carbonate upon exposure to air (The Merck Index, Rahway (NJ), Merck and Co. Inc., 11th ed. 1989).

SODIUM SULFIDE in small lumps is prone to spontaneous heating in the presence of air and moisture, temperatures may exceed 120 deg. C (Quarterly Safety Summaries, London, Association of British Chemical Manufacturers, 1942, vol. 13, p. 5).

Potential Gas Byproducts

• Hydrogen Sulfide (H2S)