The introduction of sodium hydroxide is as follows:
Sodium hydroxide, also known as caustic soda, caustic soda and caustic soda, is an inorganic compound with the chemical formula of NaOH. Sodium hydroxide is strongly alkaline and corrosive, and can be used as acid neutralizer, complexing masking agent, precipitant, precipitation masking agent, color developing agent, saponifying agent, stripping agent, detergent, etc. , and is widely used.
August 26th, 2023: CSRC agreed to register caustic soda futures and options in Zhengzhou Commodity Exchange. In the next step, the CSRC will urge Zhengzhou Commodity Exchange to do a good job to ensure the smooth launch and steady operation of caustic soda futures and options.
The chemical properties of sodium hydroxide are introduced as follows:
Sodium hydroxide is corrosive to fiber, skin, glass and ceramics. When dissolved or diluted with concentrated solution, heat will be released; The neutralization reaction with inorganic acids can also generate a lot of heat and generate corresponding salts.
Reacting with metallic aluminum and zinc, nonmetallic boron and silicon to release hydrogen; Disproportionation reaction with chlorine, bromine, iodine and other halogens. Can precipitate metal ions in aqueous solution into hydroxide; It can saponify oil and generate corresponding sodium salts and alcohols of organic acids, which is the principle of removing oil stains from fabrics.
The detection method of sodium hydroxide is introduced as follows:
Check the inventory of sodium hydroxide at least once every quarter. Because sodium hydroxide will react with carbon dioxide in the air if it is left on the surface for too long, it is necessary to check the content of its effective components. After the sodium hydroxide sample is fully dissolved, it is titrated with standard hydrochloric acid solution, and at the same time, phenolphthalein is used as an indicator to determine the content of effective components of sodium hydroxide.
Take clean weighing bottle with known weight, add about 20g of solid sodium hydroxide, cover tightly and weigh it; Then use a measuring cylinder to measure about 40mL of sodium hydroxide solution and pour it into weighing bottle. Then transfer the sample to a 500 ml conical flask.
Rinse weighing bottle with distilled water for 3-4 times, then add about 100mL distilled water, shake it slowly until it is completely dissolved, dilute it to about 400mL, cool it to room temperature and mix it thoroughly.