Boiling water is used to make caustic soda. When caustic soda enters the water, it will release heat (a lot of heat, and the boiling point will also rise). Sodium hydroxide is dissolved in water and then sprayed with a sprayer. Attention should be paid to disinfection with caustic soda: caustic soda will burn skin and organs, and it is not suitable for livestock disinfection. During disinfection, livestock and poultry should be driven out of the house.
Besides being used as a reagent, it can also be used as an alkaline desiccant in chemical experiments, because it has strong water absorption and is easy to deliquesce.
It can also absorb acidic gases (for example, in the experiment of burning sulfur in oxygen, sodium hydroxide solution can be put into a bottle to absorb toxic sulfur dioxide. )
In industry, sodium hydroxide is widely used in the national economy, and many industrial departments need sodium hydroxide. The most used sector of sodium hydroxide is chemical manufacturing, followed by papermaking, aluminum smelting, tungsten smelting, man-made fiber, man-made fiber and soap manufacturing. In addition, in the production of dyes, plastics, medicine and organic intermediates, the regeneration of old rubber, the electrolysis of sodium metal and water, and the production of inorganic salts, a large amount of caustic soda is also used to prepare borax, chromium salt, manganate and phosphate.
The characteristics of sodium hydroxide in chemical industry determine that this product is an indispensable and important substance in a large number of chemical reactions. Sodium hydroxide is one of the important raw materials for producing polycarbonate, super absorbent polymer, zeolite, epoxy resin, sodium phosphate, sodium sulfite and a large number of sodium salts.
Oleic acid is a monounsaturated fatty acid obtained by oil hydrolysis. Soft and stearic acid are saturated fatty acids, which are obtained by fat hydrolysis.
If hydrolyzed with potassium hydroxide, the soap obtained is soft.
Adding sodium chloride to the solution can reduce the solubility of fatty acid salts and make them separate. This process is called salting out. Higher fatty acid salt is the main component of soap, and block soap can be obtained by treating it with filler.