Soda (also called lye), baking soda, and big soda, are three different things.

See below for details:

1, soda, chemical formula Na2CO3 soda is a chemical raw material called anhydrous sodium carbonate, also known as soda ash, alias lye, lye noodles, soda, sodium carbonate decahydrate, soda crystals, aqueous soda, washing soda, washing soda sodium, lye crystals, crystalline soda.

Main role: Soda ash is mainly used in the production of glass, such as flat glass, bottle glass, optical glass and high-grade ware; in the chemical industry, it is used in the production of sodium salts, metal carbonates, bleach, fillers, detergents, catalysts and dyes, etc.; in metallurgy, it is used to remove sulfur and phosphorus, and is used in the beneficiation of minerals and the production of metals such as copper, lead, nickel, tin, uranium, aluminum, etc.; in ceramics, it is used for the production of refractory materials and glaze; it is used for the production of ceramics. In the ceramic industry, it is used to make refractory materials and glaze. In addition, industrial gas desulfurization, industrial water treatment, metal degreasing, cellulose and paper production, soap manufacturing, etc. also need soda ash.

2. Baking soda, sodium bicarbonate, chemical formula NaHCO?, commonly known as baking soda.

Main role: sodium bicarbonate can be used directly as a raw material in the pharmaceutical industry for the treatment of hyperacidity. It can also be used in film production, tanning, mineral processing, smelting, metal heat treatment, as well as for the fiber and rubber industries. At the same time used as wool detergent, as well as used in agriculture, such as soaking seeds. Food industry, one of the most widely used loosening agent, used in the production of cookies, pastries, steamed bread, bread, etc., is the carbon dioxide generator in the soda drink; can be compounded with alum for alkaline baking powder, but also can be compounded with soda ash for civilian lithopanic alkali; can also be used as butter preservation agent. Fire-fighting equipment used in the production of acid and alkali fire extinguishers and foam fire extinguishers. Rubber industry with alum, sodium bicarbonate porous agent with the role of uniform hair hole for rubber, sponge production.

3. Baking soda, chemical formula for Na2S2O3, sodium sulfate, also known as sodium hyposulfite, baking soda, sea wave (from its alias sodium hyposulfide).

Main function: Mainly used in the photographic industry as a fixative. It is also used as a reducing agent for dichromate in leather tanning, a neutralizing agent for nitrogen-containing exhaust, a mordant, a bleaching agent for wheat straw and wool, and a dechlorinating agent in pulp bleaching. It is also used in the manufacture of tetraethyl lead, dyestuff intermediates and the extraction of silver from ores.

Expanded Information:

Soda:

Soda ash, scientific name sodium carbonate, also known as soda, alkali ash, an important basic chemical raw material, the main product of the soda ash industry. Usually white powder, easy to decompose at high temperature, soluble in water, aqueous solution is alkaline. Sodium carbonate and water into Na2CO3-10H2O, Na2CO3-7H2O, Na2CO3-H2O three kinds of hydrates, of which Na2CO3-H2O is the most stable, and dissolved in water dissolution heat is very small, more used in the photographic industry, the name of the commodity carbon dioxide. Na2CO3-10H2O, also known as the crystal alkali or washing alkali, dissolved in water is a heat-absorbing reaction, easy to weather in the air. Na2CO3-7H2O is unstable and can be precipitated from saturated solution of sodium carbonate only in the range of 32.5~36℃.

Baking soda:

Sodium bicarbonate, chemical formula NaHCO3, commonly known as baking soda. It is a fine white crystal, less soluble in water than sodium carbonate. It is also an industrial chemical, solid 50 ℃ above the beginning of the gradual decomposition of sodium carbonate, carbon dioxide and water, 270 ℃ completely decomposed.

Sodium bicarbonate is an acid salt produced by neutralizing a strong base with a weak acid, and is weakly alkaline when dissolved in water. This property allows it to be used as a bulking agent in food preparation. Sodium bicarbonate will leave a residual sodium carbonate after its action, and using too much of it will give the finished product an alkaline flavor.

Baking soda:

Sodium thiosulfate, also known as sodium metabisulfite, baking soda, and seaborne (from its alias sodium hyposulfide). It is a common thiosulfate, colorless and transparent monoclinic crystal. Sodium thiosulfate is soluble in water and reacts with strong acids to produce sulfur and sulfur dioxide. Sodium thiosulfate is an antidote for cyanide.

It is colorless, transparent crystals or crystalline fine particles; odorless, salty taste; weathering in dry air, in wet air with deliquescence; aqueous solution shows weak alkaline reaction. With the participation of thiocyanase, it can combine with free cyanide ions in the body or combined with methemoglobin to form non-toxic thiocyanate, which can be excreted by urine and solve cyanide poisoning. In addition, it can also combine with various metal ions to form non-toxic sulfide to be excreted by urine, and it also has desensitizing effect. It is clinically used in the treatment of cyanide and nitrile poisoning, arsenic, bismuth, iodine, mercury and lead poisoning, as well as in the treatment of pruritus, chronic dermatitis, chronic urticaria, drug rash, scabies and ringworm.

Reference:Baidu EncyclopediaーSoda? Baidu Encyclopedia 百度百科ー小苏打? Baidu EncyclopediaーBaking Soda