Sodium metabisulfite (Na2S2O5) is an inorganic compound with a white or yellow crystal appearance and a strong pungent odor. Soluble in water, the aqueous solution is acidic, and contact with strong acids releases sulfur dioxide and generates the corresponding salts. In the air for a long time, it is oxidized into sodium sulfate, so sodium metabisulfite can not be long.

Melting point: >170 °C (starting at 150 °C)

Water solubility: soluble (54 g/100 ml)

Density: 1.48g /cm3

Molecular weight :190.09   

Appearance: White to light yellow crystals with pungent odor

CAS number :7681-57-4  

Use: Antioxidant

EINECS number :231-673-0   

Cautionary terms R: R22, R31, R41

Sulfur alias sulfur, colloidal sulfur, sulfur block. The appearance is light yellow brittle crystal or powder, with special odor, volatile, slightly soluble in ethanol, ether, easily soluble in carbon disulfide. As a flammable solid, sulfur is mainly used in the manufacture of dyes, pesticides, matches, gunpowder, rubber, rayon and so on. Sulfur is an important variety of inorganic pesticides. The sulfur water suspension is slightly acidic, insoluble in water, and reacts with alkali to form many hydrophobic compounds. Sulfur burns with a cyan flame and produces sulfur dioxide gas. In production, sulfur is often processed into colloidal suspension for the prevention and control of pests and diseases, which is safe for people and animals and is not easy to cause drug damage to crops.

Melting point: 114°C 

Boiling point: 444.6°C

Chemical formula: S 

Molecular weight: 32.06  

Steam pressure: 0.13kPa

Mineral density: 2.36

Water soluble: soluble in carbon disulfide, insoluble in water

CAS login number: 7704-34-9

chún jiǎn It is classified as a salt, not a base. Also known as soda or soda ash in international trade. It is an important inorganic chemical raw material, mainly used in the production of flat glass, glass products and ceramic glaze. It is also widely used in life washing, acid neutralization and food processing, etc. It is a basic chemical raw material, and is widely used in medicine (medical treatment of excessive stomach acid), paper making, metallurgy, glass, textile, dyes and other industries, and is used as a starter in food industry.

Melting point: 851℃

Boiling point: 1600°C

Decomposition temperature: 1744℃

Density: 2.532g/cm³   

Molecular weight: 105.99

CAS number: 497-19-8   

Chemical formula: Na2C03

EINECS number: 207-838-8:231-867-5  

Sodium sulfide is also known as smelly alkali, smelly soda, yellow alkali, alkali sulfide. Sodium sulfide is an inorganic compound, and pure sodium sulfide is a colorless crystalline powder. Strong moisture absorption, soluble in water. The aqueous solution has a strong alkaline reaction. Contact with skin and hair can cause burns. So sodium sulfide is commonly known as alkali sulfide. Sodium sulfide aqueous solutions oxidize slowly in air to sodium thiosulfate, sodium sulfite, sodium sulfate, and sodium polysulfide. Due to the rapid formation of sodium thiosulfate, the main product of oxidation is sodium thiosulfate. Sodium sulfide deliqueses in the air, carbonates and deteriorates, and continuously releases hydrogen sulfide gas. Industrial sodium sulfide due to impurities in its color is pink, brown red, earth yellow. Specific gravity, melting point, boiling point, also vary due to the influence of impurities.

Name: Sodium sulfide melting point: 950°C

Water solubility: 186 g/L (20℃) 

Chemical formula: Na2S   

Density: 1.86

Molecular weight: 78.04 

PH value: 12 

CAS: Login number 1313-82-2

Electrolytic manganese metal is the elemental metal extracted from manganese ore by acid leaching and then sent to an electrolytic cell. The appearance is like iron, irregular flake, solid and brittle, one side is bright, the other side is rough, silver white to brown, and silver gray after processing as powder; It is easily oxidized in air, dissolves and replaces hydrogen when encountering dilute acid, and can decompose water and release hydrogen when slightly higher than room temperature.

Function: Increase the hardness of the metal material

Equation: Mn+2H20(heat)=Mn(OH)2+H21

Alias, sodium hydroxide, commonly known as caustic soda, caustic soda, caustic soda (Hong Kong also known as "Koch's"), is a highly corrosive alkali, generally flake or granular form, easily soluble in water and form an alkaline solution, and moisture, easy to absorb water vapor in the air. Sodium hydroxide also has different applications and is one of the necessary chemicals in the chemistry laboratory, and is also one of the common chemicals. Pure products are colorless transparent crystals. Industrial products contain small amounts of sodium chloride and sodium carbonate, which are white opaque solids. There are blocky, flake, granular and rod-like. The product that forms a concentrated solution is the common name liquid alkali. Solid alkali is very hygroscopic, easily soluble in water, and strongly exothermic. It is soluble in ethanol and glycerol. In the air, the dew will eventually dissolve completely into a solution. Strong alkalinity, strong corrosion to skin, fabric, paper, etc.

Chemical formula: NaOH 

Density ：2.130g/cm3.

Melting point: 318.4℃. 

Boiling point: 1390℃.