Chemical Structure and Properties
Structural Features
Sodium Bromide has the chemical formula NaBr and is an ionic compound composed of sodium ions () and bromide ions (). In the crystal structure, sodium ions and bromide ions are bound together through ionic bonds, which are formed by the electrostatic attraction between the positive charge of sodium ions and the negative charge of bromide ions. This ionic bond endows sodium bromide with relatively high melting and boiling points.
Physical Properties
In appearance, sodium bromide is a white crystalline or powdered substance. It has no special odor and tastes salty. Its melting point is 747 °C and its boiling point is 1390 °C. These relatively high temperatures indicate that the ionic bond is strong and more energy is required to break the ionic bonds and transform the substance from the solid state to the liquid or gaseous state.
Sodium bromide has good solubility in water, with a solubility of approximately 90.5g/100g water at 20 °C.
Sources and Extraction Methods
Natural Sources
Sodium bromide exists in small amounts in nature, mainly in some salt lakes and seawater. In the brine of salt lakes, sodium bromide is one of the many salt components and can be separated through a series of evaporation and crystallization processes.
Product Applications
Applications in the Pharmaceutical Field
Sodium bromide was once used as a sedative in medicine. It can regulate the excitability of the nervous system and, by affecting the ion channels of nerve cells, inhibit the conduction of nerve impulses to a certain extent, thus playing a sedative role. However, with the development of medicine, its use has been somewhat restricted because the accumulation of bromide ions in the body may have adverse effects on human health.
Applications in the Photographic Field
Sodium bromide is an important component of photosensitive materials. In film manufacturing, it forms a photosensitive emulsion together with silver salts (such as silver bromide). Sodium bromide can adjust the photosensitive properties of the photosensitive emulsion. For example, it can control the sensitivity and contrast of the film. During the exposure process, the bromide ions in silver bromide participate in the photochemical reaction, enabling the film to record images.
Applications in the Chemical Field
Sodium bromide is an important reagent in organic synthesis. It can serve as a source and provide atoms in some organic reactions. For example, in bromination reactions, sodium bromide can react with certain organic compounds to introduce atoms into the organic molecules, thus synthesizing organic bromides with specific structures and functions. These organic bromides have a wide range of applications in drug synthesis, materials chemistry and other fields.
Product Packaging and Storage Conditions
Packaging Materials
Sodium bromide is usually packaged in woven bags, plastic buckets or glass bottles lined with plastic bags. For high - purity sodium bromide, especially for fields with extremely high - purity requirements (such as the electronics industry), double - layer packaging with better sealing performance may be adopted, such as a plastic film as the inner layer and a metal drum as the outer layer to prevent the product from getting damp, oxidized and affected by other pollutants.
Storage Conditions
It should be stored in a cool, dry and well - ventilated place, avoiding direct sunlight. The ideal storage temperature is generally between 2 - 8 °C. Sodium bromide should be kept away from fire sources and strong oxidizing agents during storage. Although it is a stable compound itself, dangerous chemical reactions may occur when it is at a high temperature or in contact with strong oxidizing agents. At the same time, it is necessary to prevent the product from getting damp and avoid mixing it with acidic substances to prevent chemical reactions that may affect the product quality.
){kind=link}