Sodium nitrite is an inorganic compound with the chemical formula NaNO2, a white crystalline powder, easily soluble in water, slightly soluble in ethanol, methanol, and ether, mainly used in the manufacture of azo dyes, but also as a mordant for fabric dyeing, bleaching agent, metal heat treatment agent. Sodium nitrite is also used as a coloring agent and preservative in the processing of meat products. Because sodium nitrite behaves as an alkaline reaction and reacts with oxygen in the air, it can be used to prevent rust in steel sheets.
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