Soda Ash

The scientific name of soda is sodium carbonate

Soda is a kind of chemical raw material, called anhydrous sodium carbonate, also known as soda ash, soda, sodium carbonate decahydrate, soda crystal, hydrated soda, washing soda, washing soda sodium, alkali crystal, crystal soda.

The scientific name of soda is sodium carbonate, an important basic chemical raw material and the main product of the soda ash industry. Usually white powder, easily decomposed at high temperature, easily soluble in water, and the aqueous solution is alkaline. Sodium carbonate and water generate three hydrates: Na2CO3·10H2O, Na2CO3·7H2O, and Na2CO3·H2O. Among them, Na2CO3·H2O is the most stable and has a very small heat of dissolution in water. It is mostly used in the photographic industry. The product name is Carbon Oxygen. Na2CO3·10H2O, also known as crystalline alkali or washing alkali, is an endothermic process when it is dissolved in water and is easily weathered in the air. Na2CO3·7H2O is unstable and can be precipitated from saturated sodium carbonate solution only in the range of 32.5～36℃.

Chemical formula: Na2CO3

Molecular weight: 105.99

Appearance: white powder or fine crystals (anhydrous pure product)

Taste: astringent

Relative density (water = 1): 2.532

Melting point: 851°C

Chemical nature

1) The solution is alkaline and can react with acid: Na2CO3+2HCl=2NaCl+H2O+CO2↑

2) Na2CO3 reacts with alkali: Na2CO3+Ca(OH)2=CaCO3↓+2NaOH

3) Na2CO3, NaCl reacts with salt: Na2CO3+BaCl2=BaCO3↓+2NaCl

4) Na2CO3 reacts with CO2: Na2CO3+CO2+H2O=2NaHCO3

[ Stability ]

It can be decomposed at high temperature to produce sodium oxide and carbon dioxide. Long-term exposure to the air can absorb moisture and carbon dioxide in the air, generate sodium bicarbonate, and form hard lumps. It has strong hygroscopicity, it is easy to form hard lumps, and it will not decompose under high temperature. There are 3 types of sodium carbonate containing crystal water: Na2CO3·H2O, Na2CO3·7H2O and Na2CO3·10H2O.

[ Solubility ]

Easily soluble in water, slightly soluble in absolute ethanol, insoluble in propanol. Sodium carbonate is easily soluble in water and is a weak acid salt. After being dissolved in water, it undergoes hydrolysis reaction, making the solution alkaline and corrosive. It can neutralize with acid to generate corresponding salt and release carbon dioxide.

[ Usage ]

Soda ash is mainly used to produce glass, such as flat glass, bottle glass, optical glass and high-grade utensils; in the chemical industry, it is used to prepare sodium salts, metal carbonates, bleaches, fillers, detergents, catalysts and dyes, etc.; In the metallurgical industry, it is used to remove sulfur and phosphorus, used in mineral processing and the production of copper, lead, nickel, tin, uranium, aluminum and other metals; in the ceramic industry, it is used to prepare refractory materials and glazes. In addition, soda ash is also required for industrial gas desulfurization, industrial water treatment, metal degreasing, cellulose and paper production, and soap manufacturing.

It can be directly used as a raw material for the pharmaceutical industry. It can also be used in filmmaking, leather tanning, mineral processing, smelting, metal heat treatment, as well as in the fiber and rubber industries. At the same time, it is used as wool detergent, foam fire extinguishing agent, and agricultural seed soaking. Used in fire fighting equipment to produce acid-base fire extinguishers and foam fire extinguishers. The rubber industry uses it in combination with alum and H pore-forming agent to produce uniform pores for the production of rubber and sponge. The metallurgical industry is used as a flux for casting steel ingots. Used in the machinery industry as a forming aid for cast steel (sand foundry) sand molds. In the printing and dyeing industry, it is used as a fixing agent for dyeing and printing, an acid-base buffer, and a post-treatment agent for fabric dyeing and finishing. The pharmaceutical industry is used as a raw material for antacids.

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