Production process: first dissolve calcium oxide in water to make lime water
CaO+H2O=Ca(OH)2
This process is an exothermic reaction, pay attention to the splash of lime water to hurt people.
Sodium carbonate is reacted with lime water to form sodium hydroxide:
Na2CO3+Ca(OH)2=CaCO3+2NaOH
Sodium hydroxide, the chemical formula is NaOH, commonly known as caustic soda, caustic soda, caustic soda, is a strong corrosive alkali, generally in the form of flakes or granules, easily soluble in water (exothermic when dissolved in water) and forms Alkaline solution, otherwise deliquescence, easy to absorb water vapor (deliquescence) and carbon dioxide (deterioration) in the air.
Uses: Sodium hydroxide (NaOH) has a wide range of uses. It is used in papermaking, soap, dyes, rayon, aluminum, petroleum refining, cotton fabric finishing, purification of coal tar products, as well as food processing, wood processing and machinery industry.
Sodium hydroxide removal step
The impurities are mainly sodium carbonate
Removal method: firstly prepare a relatively concentrated solution, in which Na2CO3 is insoluble (same ion effect), and a purer NaOH solution can be obtained
It can also be washed with a small amount of water before preparing the solution (Na2CO3 produced by metamorphism is mainly concentrated on the surface of NaOH particles)
