NaBr, a salt; colorless crystals. Density, 3.20 g/cm³; melting point, 760°C. Solubility in water, 48.6 percent at 25°C and 54.8 percent at 100°C; NaBr-2H₂0 crystallizes from aqueous solutions at ordinary temperatures. Sodium bromide is prepared upon interaction of bromide with NaOH solutions in the presence of reducing agents or by an exchange reaction between Fe₃Brs and Na2C0₃. It is used in the manufacture of photosensitive materials (silver bromide films and paper), and also in medicine (as a sedative and soporific).