Sodium Bicarbonate, the molecular formula is NAHCO₃，is an inorganic compound, with white crystalline powder, no odor, salty, easy to dissolve in water. Slowly decompose in humid air or hot air, generate carbon dioxide, and heat up to 270 ° C completely decomposed. When it is acidic, it is strongly decomposed, producing carbon dioxide.
Sodium bicarbonate is widely used in terms of analysis of chemistry, inorganic synthesis, industrial production, agricultural and animal husbandry production.
Physical properties: sodium bicarbonate is a white crystal, or the opaque monocliplative crystals are slightly crystals, which are not odor, slightly salty and cool, and are easily soluble in water and glycerin, and insoluble in ethanol. The solubility in the water is 7.8g (18℃), 16.0g (60℃), the density is 2.20g/cm3, the proportion is 2.208, the refractive index is α: 1.465; β: 1.498; γ: 1.504, standard entropy 24.4J/(mol · K), generate heat 229.3kj/mol, dissolved heat 4.33kj/mol, and than hot capacity（Cp）20.89J/(mol·°C)(22°C).
Chemical properties:
1. Acid and alkaline
The aqueous solution of sodium bicarbonate is weakly alkaline due to hydrolysis: HCO3-+H2O⇌H2CO3+OH-, 0.8%aqueous solution pH value is 8.3.
2. React with acid
Sodium bicarbonate can react with acid, such as sodium bicarbonate and hydrochloride: nahco3+HCL = NaCl+CO2 ↑+H2O.
3. Reaction to alkali
Sodium bicarbonate can react with alkali. For example, sodium bicarbarbonate and sodium hydroxide reaction: nahco3+naOh = Na2CO3+H2O; and calcium hydroxide reactions, if the amount of sodium sodium bicarbonate is in full, there are: 2NAHCO3+CA (OH) 2 = CACO3 ↓+NA2CO3+2H2O;
If there is a small amount of sodium bicarbonate, there are: Nahco3+CA (OH) 2 = CACO3 ↓+Naoh+H2O.
4. Reaction to salt
A. Sodium bicarbonate can double hydrolysis with aluminum chloride and aluminum chloride, and generate aluminum hydroxide, sodium salt and carbon dioxide.
3AHCO3+AlCl3 = Al (OH) 3 ↓+3ACL+3CO2 ↑; 3AHCO3+Al (CLO3) 3 = Al (OH) 3 ↓+3AClo3+3CO2 ↑.
B. Sodium bicarbonate can react with certain metal salt solutions, such as: 2HCO3-+Mg2+= CO2 ↑+MgCo3 ↓+H2O.
5. Decomposition by heat
The nature of sodium bicarbonate is stable at the temperature, and it is easy to break down. It is quickly decomposed at above 50 ° C. At 270 ° C, the carbon dioxide is completely lost. There is no change in the dry air and slowly decompose in the humid air. Decomposition The reaction equation: 2NAHCO3NA2CO3+CO2 ↑+H2O.
Application field:
1. Laboratory use
Sodium bicarbonate is used as analytical reagents and is also used for inorganic synthesis. It can be used to prepare sodium carbonate-sodium bicarbonate buffer solution. When adding a small amount of acid or alkali, it can keep the concentration of hydrogen ions without significant changes, which can maintain the system pH value relatively stable.
2. Industrial use
Sodium bicarbonate can be used to produce pH fire extinguishers and foam fire extinguishers, and sodium bicarbonate in the rubber industry can be used for rubber and sponge production. Sodium bicarbonate in the metallurgical industry can be used as a melting agent for casting steel ingots. Sodium bicarbonate in the mechanical industry can be used as a molding assistant for cast steel (sandwiches) sand. Sodium bicarbonate in the printing and dyeing industry can be used as a color fixing agent, acid -base buffer, and fabric dyeing rear treatment agent in staining printing; adding soda to the dyeing can prevent the gauze in the gauze. Prevention.
3. Food processing use
In food processing, sodium bicarbonate is the most widely used loose agent that is used to produce biscuits and bread. The color is yellow -brown. It is a carbon dioxide in a soda drink; it can be compounded with alum to alkaline fermented powder, or it can be composed of citromes as civilian stone alkali; but also as a butter preservation agent. It can be used as a fruit and vegetable coloring agent in vegetable processing. Adding about 0.1%to 0.2%of sodium bicarbonate when washing fruits and vegetables can stabilize green. When sodium bicarbonate is used as a fruit and vegetable treatment agent, it can increase the pH value of fruits and vegetables by cooking fruit and vegetables, which can increase the pH value of fruits and vegetables, improve the water holdings of protein, promote the softening of food tissue cells, and dissolve the astringent components. In addition, there is an effect on goat milk, with a amount of use of 0.001%~ 0.002%.
4. Agriculture and animal husbandry
Sodium bicarbonate can be used for agricultural soaking, and it can also make up for the lack of lysine content in the feed. Soluble sodium bicarbonate in a small amount of water or mixes into the concentrate to feed the beef (appropriate amount) to promote the growth of beef. It can also significantly increase the milk production of dairy cows.
5. Medical use
Sodium bicarbonate can be used as a raw material for pharmaceuticals, which is used to treat excessive gastric acid, metabolic acid poisoning, and can also alkaline urine to prevent uric acid stones. It can also reduce the kidney toxicity of sulfa drugs, and prevent hemoglobin from depositing in the renal tubular when acute hemolysis, and treat the symptoms caused by excessive gastric acid; intravenous injection is non -specific to drug poisoning The treatment effect. Continuous headache, loss of appetite, nausea, vomiting, etc.
Storage and transportation note: Sodium bicarbonate is a non -dangerous product, but it should be prevented from moisture. Store in a dry ventilation tank. Do not mix with acid. Edible baking soda must not be mixed with toxic items to prevent pollution.
Packing：25KG/BAG
Post time: Mar-17-2023