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Molecular weight: 65.0 pK = 4.8 Melting point: Upon heating decomposes to sodium and nitrogen1 Sodium azide is a commonly used preservative for laboratory reagents. Typical effective concentrations used by Sigma range form 0.02% to 0.1% (w/v). Sodium azide is also an inhibitor of peroxidase2, myeloperoxidase3, superoxide dismutase4, galactose oxidase5, catalase6,7, and 02 evolution in photosynthesis8. The mechanism of its inhibition and toxic