Soda ash-soda (scientific name: anhydrous sodium carbonate, common name: stone ash, soda ash, washing soda) is an important chemical basic raw material. The chemical formula of soda is Na₂CO₃, easily soluble in water, slightly soluble in absolute ethanol, insoluble in propanol, and its aqueous solution is alkaline. Soda is in the form of colorless crystals, the water of crystallization is unstable, and it is easy to weather. Therefore, it is usually a white powder, a strong electrolyte, and has salt compatibility and thermal stability.

Name：Sodium Carbonate

Alias:Sodium carbonate anhydrous; Sodium carbonate solution;

soda ash; disodium carbonate; Sodium carbonate-12C, 13C-depleted; calcined soda; Carbonic acid disodium salt; Sodium carbonate,high-purity; Sodium carbonate,dense; SODA ASH LIGHT

EINECS 231-867-5

Chinese aliases (commonly known): Soda ash, block ash, soda (Soda), Koujian (historically, it was generally transshipped across the country via Zhangjiakou and Gubeikou, so it was also called "Koujian".), Alkaline noodles (edible soda).

Sodium carbonate that exists in nature (such as salt lakes) is called trona.

The industrial name of sodium carbonate without crystal water is light alkali, and the industrial name of sodium carbonate with crystal water is heavy alkali.

Sodium carbonate is a salt, not an alkali. The aqueous solution of sodium carbonate is alkaline, so it is also called soda ash.

Character

Sodium carbonate Sodium carbonate is white powder or granules at room temperature. Odorless. It is a strong base and weak acid salt. Absorbent. Expose to the air and gradually absorb 1mol/L moisture (about 15%). Acid decomposition and effervescence. Soluble in water (3.5 parts at room temperature, 2.2 parts at 35°C) and glycerin, slightly soluble in absolute ethanol. The aqueous solution is strongly alkaline, pH 11.6. Relative density (25°C) 2.53. The melting point is 851°C. The median lethal dose (30 days) (mice, intraperitoneal cavity) was 116.6mg/kg. irritating. It can be formed by chemical reaction of sodium hydroxide and carbonic acid. The solution is alkaline. Sodium carbonate decomposes at 2132K.

Solubility

Sodium carbonate is easily soluble in water, glycerol, 20 grams of sodium carbonate can be dissolved in 100 grams of water at 20 degrees Celsius, the solubility is the largest at 35.4 degrees Celsius, 49.7 grams of sodium carbonate can be dissolved in 100 grams of water, slightly soluble in absolute ethanol, insoluble in propanol . Sodium carbonate is a kind of strong alkali salt, which will undergo hydrolysis reaction after being dissolved in water (sodium carbonate hydrolysis will produce sodium bicarbonate and sodium hydroxide), making the solution alkaline and corrosive to a certain extent, and can carry out metathesis reaction with acid ( ), forming the corresponding salt and releasing carbon dioxide.

stability

It has strong stability, but it can also be decomposed at high temperature to generate 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, is easy to form hard lumps, and does not decompose under high temperature. There are three kinds of sodium carbonate containing crystal water: Na2CO3·H2O, Na2CO3·7H2O and Na2CO3·10H2O.

The main purpose

Sodium carbonate is one of the important chemical raw materials. It is widely used in light industry daily chemical, building materials, chemical industry, food industry, metallurgy, textile, petroleum, national defense, medicine and other fields. It is used as a raw material for the manufacture of other chemicals, cleaning agents, Detergents are also used in the fields of photography and analysis. Followed by metallurgy, textiles, petroleum, national defense, medicine and other industries.