Công ty cổ phần Hóa chất Công nghệ mới Việt Nam

Công ty cổ phần Hóa chất Công nghệ mới Việt Nam

Xô đa Na2CO3 TQ-99%-40kg Hóa chất công nghiệp

Xô đa
Na2CO3
TQ-99%-40kg
Hóa chất công nghiệp
http://vietnamchemtech.com.vn/chitietSP.asp?id_pro=1404

Mô tả sản phẩm:

Natri cacbonat là một loại muối cacbonat, có công thức hóa học là Na₂CO₃. Natri cacbonat là một muối bền trong tự nhiên, thường có trong nước khoáng, nước biển và muối mỏ trong lòng đất. Một số rất ít tồn tại ở dạng tinh thể có lẩn canxi cacbonat. Quá trình hình thành trong tự nhiên chủ yếu do sự thay đổi địa hình Trái Đất làm một số hồ gần biển hoặc vịnh bị khép kín, dần dần lượng muối tích tụ lại và bị chôn vùi vào lòng đất tạo thành mỏ muối. Lướng muối còn lại trong tự nhiên (nước biển) được hình thanh do hòa tan khí CO₂ trong không khi.

Ứng dụng

• Natri cacbonat với tên thường gặp trong đời sống là sô đa hay bột nở có tác dụng tạo xốp, giòn cho thức ăn và ngoài ra còn có tác dụng làm đẹp cho bánh.
• Trong công nghiệp, natri cacbonat được dùng để nấu thủy tinh, xà phòng.
• Sản xuất keo dán gương, thủy tinh lỏng.

Danh pháp IUPAC	Sodium carbonate
Tên khác	Sô đa Bột nở Cacbonat natri
Nhận dạng
Số CAS	[497-19-8]
Thuộc tính
Công thức phân tử	Na2CO3
Phân tử gam	105.9884 g/mol
Bề ngoài	Tinh thể màu trắng
Tỷ trọng	2.54 g/cm3, thể rắn
Điểm nóng chảy	851 °C (1124 K)
Điểm sôi	1600 °C (2451 K)
Độ hòa tan trong nước	22 g/100 ml (20 °C)
Độ bazơ (pKb)	3,67
Các nguy hiểm
MSDS	ngoài
NFPA 704	0 1 1
Điểm bắt lửa	Không bắt lửa.
Các hợp chất liên quan
Anion khác	Natri bicacbonat
Cation khác	Liti cacbonat Kali cacbonat Rubidi cacbonat Xezi cacbonat

Sodium carbonate Na2CO3 China-technical-40kg Industry chemicals

Sodium carbonate
Na2CO3
China-technical-40kg
Industry chemicals
http://en.vietnamchemtech.com.vn/chitietSP.asp?id_pro=479

Product description :

Sodium carbonate (also known as washing soda or soda ash), Na₂CO₃ is a sodium salt of carbonic acid. It most commonly occurs as acrystalline heptahydrate, which readily effloresces to form a white powder, the monohydrate. Sodium carbonate is domestically well known for its everyday use as a water softener. It can be extracted from the ashes of many plants. It is synthetically produced in large quantities from salt (sodium chloride) and limestone in a process known as the Solvay process.

Uses

The manufacture of glass is one of the most important uses of sodium carbonate. When combined with silica and calcium carbonate and heated to high temperatures, then cooled rapidly, glass is produced. This type of glass is known as soda lime glass.

Sodium carbonate is also used as a relatively strong base in various settings. For example, sodium carbonate is used as a pH regulator to maintain stable alkaline conditions necessary for the action of the majority of photographic developing agents.

It is a common additive in municipal pools used to neutralize the acidic effects of chlorine and raise pH.

In cooking, it is sometimes used in place of sodium hydroxide for lyeing, especially with German pretzels and lye rolls. These dishes are treated with a solution of an alkaline substance in order to change the pH of the surface of the food and thus improve browning.

In taxidermy, sodium carbonate added to boiling water will remove flesh from the skull or bones of trophies to create the "European skull mount" or for educational display in biological and historical studies.

In chemistry, it is often used as an electrolyte. This is because electrolytes are usually salt-based, and sodium carbonate acts as a very good conductor in the process of electrolysis. In addition, unlike chloride ions, which form chlorine gas, carbonate ions are not corrosive to the anodes. It is also used as a primary standard for acid-base titrations because it is solid and air-stable, making it easy to weigh accurately.

Domestic use

In domestic use, it is used as a water softener during laundry. It competes with the magnesium and calcium ions in hard water and prevents them from bonding with the detergent being used. Without using washing soda, additional detergent is needed to soak up the magnesium and calcium ions. Called washing soda, soda crystals, or sal soda in the detergent section of stores, it effectively removes oil, grease, and alcohol stains. Sodium carbonate is also used as a descaling agent in boilers such as those found in coffee pots, espresso machines, etc.

In dyeing with fiber-reactive dyes, sodium carbonate (often under a name such as soda ash fixative or soda ash activator) is used to ensure proper chemical bonding of the dye with cellulose (plant) fibers, typically before dyeing (for tie dyes), mixed with the dye (for dye painting), or after dyeing (for immersion dyeing).

Other applications

Sodium carbonate is a food additive (E500) used as an acidity regulator, anti-caking agent, raising agent, and stabilizer. It is one of the components of kansui, a solution of alkaline salts used to give ramen noodles their characteristic flavor and texture. It is also used in the production of snus (Swedish-style snuff) to stabilize the pH of the final product. In Sweden, snus is regulated as a food product because it is put into the mouth, requires pasteurization, and contains only ingredients that are approved as food additives.

Sodium carbonate is also used in the production of sherbet powder. The cooling and fizzing sensation results from the endothermic reaction between sodium carbonate and a weak acid, commonly citric acid, releasing carbon dioxide gas, which occurs when the sherbet is moistened by saliva.

In China, it is used to replace lye-water in the crust of traditional Cantonese moon cakes, and in many other Chinese steamed buns and noodles.

Sodium carbonate is used by the brick industry as a wetting agent to reduce the amount of water needed to extrude the clay.

In casting, it is referred to as "bonding agent" and is used to allow wet alginate to adhere to gelled alginate.

Sodium carbonate is used in toothpastes, where it acts as a foaming agent and an abrasive, and to temporarily increase mouth pH.

Sodium carbonate is used to create the photo process known as reticulation.

Sodium carbonate, in a solution with common salt, may be used for cleaning silver. In a non-reactive container (glass, plastic or ceramic) aluminium foil and the silver object are immersed in the hot salt solution. The elevated pH dissolves the aluminium oxide layer on the foil and enables an electrolytic cell to be established . Hydrogen ions produced by this reaction reduce the sulphide ions on the silver restoring silver metal. The sulphide can be released as small amounts of hydrogen sulphide. Rinsing and gently polishing the silver restores a highly polished condition. ^[4]

Other names[hide] Soda ash Washing soda Soda crystals
Identifiers
CAS number	497-19-8 ,  5968-11-6 (monohydrate) 6132-02-1 (decahydrate)
PubChem	10340
ChemSpider	9916
UNII	45P3261C7T
EC number	207-838-8
ChEBI	CHEBI:29377
ChEMBL	CHEMBL186314
RTECS number	VZ4050000
Jmol-3D images	Image 1
SMILES [show]
InChI [show]
Properties
Molecular formula	Na2CO3
Molar mass	105.9784 g/mol (anhydrous) 124.00 g/mol (monohydrate) 286.14 g/mol (decahydrate)
Appearance	White solid, hygroscopic
Odor	Odorless
Density	2.54 g/cm3 (anhydrous) 2.25 g/cm3 (monohydrate) 1.51 g/cm3 (heptahydrate) 1.46 g/cm3 (decahydrate)
Melting point	851 °C (anhydrous)[1] 100 °C (decomp, monohydrate) 33.5 °C (decomp, decahydrate) 32 °C (heptahydrate)
Boiling point	1633 °C (anhydrous)
Solubility in water	7 g/100 mL (0 °C) 21.6 g/100 mL (20 °C)[1] 450 g/L (100 °C)[2]
Solubility	insoluble in ethanol, acetone
Basicity (pKb)	4.67
Refractive index(nD)	1.485 (anhydrous) 1.420 (monohydrate) 1.405 (decahydrate)
Structure
Coordination geometry	trigonal planar
Thermochemistry
Std enthalpy of formation ΔfHo298	−1131 kJ·mol−1[3]
Standard molar entropy So298	136 J·mol−1·K−1[3]
Hazards
MSDS	MSDS
EU Index	011-005-00-2
EU classification	Irritant (Xi)
R-phrases	R36
S-phrases	(S2), S22, S26
NFPA 704	0 1 1
Flash point	Non-flammable
LD50	4090 mg/kg (rat, oral)
Related compounds
Other anions	Sodium bicarbonate
Other cations	Lithium carbonate Potassium carbonate Rubidium carbonate Caesium carbonate
Related compounds	Ammonium carbonate Natron Sodium percarbonate

Sodium metabisulfite Na2S2O5 Italia-Foog grade-25kg Pharmaceuticals & fine Chemical

Sodium metabisulfite
Na2S2O5
Italia-Foog grade-25kg
Pharmaceuticals & fine Chemical
http://en.vietnamchemtech.com.vn/chitietSP.asp?id_pro=478

Product description :

Sodium metabisulfite or sodium pyrosulfite (IUPAC spelling Br. E. sodium metabisulphite or sodium pyrosulphite) is an inorganic compound of chemical formula Na₂S₂O₅. The substance is sometimes referred to asdisodium (metabisulfite). It is used as a disinfectant, antioxidant and preservative agent.

Uses

Food additive

It is used as a preservative and antioxidant in food and is also known as E223.^[3]

It may cause allergic reactions in those who are sensitive to sulfites, including respiratory reactions in asthmatics,anaphylaxis and other allergic reactions in sensitive individuals.^[4][5]

Sodium metabisulfite and potassium metabisulfite are the primary ingredients in Campden tablets, used for wine andbeer making.^[6]

The acceptable daily intake is up to 0.7 mg per kg of body weight.^[7] Sodium metabisulfite has no side effects it is oxidised in the liver to harmless sulfate and excreted in urine.^{[8][clarification needed]}

Sanitization and cleaning agent

It is commonly used in homebrewing and winemaking to sanitize equipment. It is used as a cleaning agent for potable water reverse osmosis membranes in desalination systems. It is also used to remove chloramine from drinking water after treatment.

Other uses

• Added to local anaesthetic(lidocaine etc) solutions to prevent oxidation of vasoconstrictor adrenaline and thus improve the shelflife of the solution
• It is used in photography.^[9]
• Concentrated sodium metabisulfite can be used to remove tree stumps. Some brands contain 98% sodium metabisulfite, and cause degradation of lignin in the stumps, facilitating removal.^[10]
• It is also used as an excipient in some tablets, such as paracetamol. Approximately 0.5 mg is used in epinephrine autoinjectors such as the EpiPen.
• A very important health related aspect of this substance is that it can be added to a blood smear in a test for sickle cell anaemia (and other similar forms of haemoglobin mutation). The substances causes defunct cells to sickle (through a complex polymerisation) hence confirming disease.
• It is also used to precipitate gold from auric acid (gold dissolved in aqua regia).
• Other names[hide]

  Sodium pyrosulfite
  Sodium disulfite
  Identifiers CAS number 7681-57-4  PubChem 24346 EC number 231-673-0 RTECS number UX8225000 PropertiesMolecular formula Na₂S₂O₅, Na-O-(S=O)-O-(S=O)-O-Na Molar mass 190.107 g/mol Appearance white powder Density1.48 g/cm³ Melting point
  >170 °C (begins at 150 °C)
  Solubility in water 54 g/100 ml Hazards MSDS Mallinckrodt MSDS EU Index 016-063-00-2 EU classification Harmful (Xn)
  Irritant (Xi) R-phrases R22 R31 R41 S-phrases (S2) S26 S39 S46 NFPA 704
  

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  Related compounds Other anions Sodium sulfite
  Sodium bisulfite Other cations Potassium metabisulfite Related compounds Sodium dithionite
  Sodium thiosulfate
  Sodium sulfate   (verify) (what is: /?)
  Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references