Soda is the phonetic translation of Soda, the chemical formula for Na2CO3. it is quite a lot of names, the scientific name is sodium carbonate, the common name in addition to the name of soda, but also known as soda ash or soda powder. With crystalline water called sodium carbonate hydrate, there are sodium carbonate monohydrate (Na2CO3-H2O), sodium carbonate heptahydrate (Na2CO3-7H2O) and sodium carbonate decahydrate (Na2CO3-10H2O) three. Sodium carbonate decahydrate is also called washing soda, washing soda or crystal soda.
Sodium carbonate anhydrous is white powder or fine grains, easily soluble in water, and the aqueous solution is alkaline. It has strong hygroscopicity and can absorb moisture in the air and form hard lumps. Sodium carbonate decahydrate is a colorless crystal, which will lose its water of crystallization and become sodium carbonate monohydrate when placed in air at room temperature. Whether it is sodium carbonate decahydrate or sodium carbonate monohydrate, it will become anhydrous sodium carbonate when heated. Sodium carbonate is very stable and does not decompose easily when heated. It can release carbon dioxide when exposed to acid:
Na2CO3+2HCl====2NaCl+H2O+CO2↑?
Sodium carbonate solution can also absorb carbon dioxide into sodium bicarbonate:
Na2CO3+H2O+CO2====2NaHCO3
In the three kinds of soda, sodium carbonate is the most widely used. It is a very important chemical product, is an important raw material for glass, soap, textile, paper, tanning and other industries. It is also used in the metallurgical industry and for water purification. It can also be used in the manufacture of other sodium compounds. As early as in the 18th century, it was listed as one of the basic chemical raw materials - three acids and two bases - together with sulfuric acid, hydrochloric acid, nitric acid and caustic soda. In daily life, soda also has many uses, for example, it can be used directly as a detergent, and adding some soda when steaming steamed buns can neutralize the acids produced during fermentation.
Baking soda
The chemical formula of baking soda is NaHCO3. It also has many names, the scientific name of sodium bicarbonate, also known as sodium bicarbonate or sodium carbonate
Sodium carbonate. Common names other than baking soda include baking soda, fermentation soda, and bicarbonate of soda.
Baking soda is a white crystal, soluble in water, and the aqueous solution is weakly alkaline. In hot air, it can decompose slowly, releasing part of the carbon dioxide; when heated to 270 ℃ all decomposition releases carbon dioxide:
2NaHCO3====Na2CO3 + H2O + CO2↑, it can also be used with acid (such as hydrochloric acid) to release carbon dioxide:
NaHCO3 + HCl====NaCl + H2O + CO2↑ < /p>
These properties of baking soda give it many important uses in production and life. In fire extinguishers, it is one of the raw materials for the production of carbon dioxide; in the food industry, it is one of the main raw materials for baking powder; in the manufacture of refreshing beverages, it is also a commonly used raw material; and in medicine, it is an agent for the treatment of excessive stomach acid.
Baking soda and baking soda solution are both weakly alkaline and should have some decontamination ability. The online legend that cures blackheads is baking soda, so don't buy the wrong one...
In fact, I think if you don't have sensitive skin, you can use cleanclear's "Pore Cleansing Milk", which is pretty good!
Additionally, a small recipe for blackheads can be found in milk with a pinch of salt, which is safer and worth a try!