Bromide refers to compounds containing bromine in oxidation state -1, including hydrogen bromide, ammonium bromide, metal bromides, and non-metal bromides. The properties are between Chloride and Iodide . Bromide ion is the preferred reducing agent. The stability of complex formation is between that of iodine and chlorine. Most are easily soluble in water, but the bromides of copper (I), silver (I), mercury (I) and lead (II) are more difficult to dissolve. Clinically, bromide usually refers to potassium bromide, sodium bromide and ammonium bromide, commonly known as "tribromide". In addition, silver bromide is used in photographic film and photosensitive paper, and copper bromide can be used as a brominating agent in organic synthesis. Metal bromides can be prepared by the direct combination of bromine and metals (such as aluminum bromide) or by the interaction of hydrobromic acid with metal hydroxides (or their salts). Sodium Bromide Sodium Bromide is white crystal or powder. Salty or slightly bitter. Absorbs moisture from the air and clumps without deliquescence. Dissolved in water. Low toxicity, irritating. Used for trace determination of cadmium in analytical chemistry, photoengraving, and pharmaceuticals. Physical and chemical properties Colorless cubic crystal or white granular powder. Odorless, alkaline and slightly bitter. Relative density 3.203 (25 ℃). Melting point 747 ℃. Hygroscopic in air. It is easily soluble in water (the solubility is 121g/100ml water at 100℃), and the aqueous solution is neutral. Slightly soluble in alcohol. Anhydrous sodium bromide crystals are precipitated in the solution at 51°C, and dihydrate is formed below 51°C. Its bromide ion can be replaced by chlorine. Potassium Bromide Chemical formula: KBr Properties: White crystal or powder with deliquescence. Dissolved in water. purposes : used as nerve sedatives, and for photography brominated paper and so on. Preparation method:
a) It is prepared by adding potassium Carbonate (K2CO3) solution to iron bromide (FeBr3) solution, and evaporating the supernatant for crystallization.
b) Passing bromine vapor (Br2) into potassium Hydroxide (KOH) to prepare. Bromide, its representative drug is potassium bromide (or sodium). The main role of bromide is to strengthen the inhibitory process of the cerebral cortex, making it more concentrated, thereby regulating the high-level neural activity that is out of balance and returning it to normal. Patients with hypertension and edema should not take bromide; patients with epilepsy should not use ammonium bromide; patients with severe pulmonary insufficiency, bronchial asthma and respiratory center depression caused by craniocerebral injury should avoid using hypnotics. Sedative-hypnotic drugs should be used with caution in patients with liver and renal insufficiency.
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