Sodium hydroxide
Sodium hydroxide
Sodium hydroxide, also known as caustic soda, caustic soda, fire soda, and caustic soda, is an inorganic compound with a chemical formula of NaOH and a relative molecular weight of 39.9970.
Sodium hydroxide is highly alkaline and highly corrosive. It can be used as acid neutralizer, masking agent, precipitant, precipitation masking agent, color developer, saponification agent, peeling agent, detergent, etc. It has a wide range of uses.
Chemical properties
Sodium hydroxide has a corrosive effect on fibers, skin, glass, ceramics, etc. It will release heat when dissolved or diluted with concentrated solutions; neutralization reactions with inorganic acids can also generate a large amount of heat and generate corresponding salts; it can react with metal aluminum and zinc , react with non-metallic boron and silicon to release hydrogen; and undergo disproportionation reactions with halogens such as chlorine, bromine and iodine. It can precipitate metal ions from aqueous solutions into hydroxides; it can cause saponification of oils and generate corresponding sodium salts of organic acids and alcohols. This is the principle of removing oil stains on fabrics.
Storage method
1. Sodium hydroxide is slightly corrosive to glass products. The two will generate sodium silicate, causing the piston in the glass instrument to stick to the instrument. Therefore, glass bottle stoppers cannot be used when holding sodium hydroxide solution, otherwise the bottle cap may not be opened.
2. If a glass container is used to hold hot sodium hydroxide solution for a long time, it will also cause damage to the glass container.
3. Sodium hydroxide should be stored in a cool, dry, and well-ventilated warehouse. Keep away from fire and heat sources. The storage temperature does not exceed 35°C and the relative humidity does not exceed 80%. The packaging must be sealed and protected from moisture. They should be stored separately from flammable (combustible) materials, acids, etc., and avoid mixed storage. Suitable materials should be available in the storage area to contain spills. Solid sodium hydroxide is packed into 0.5 mm thick steel drums and tightly sealed, with the net weight of each drum not exceeding 100 kg;
