Sodium bicarbonate can react with both acids and bases, so the ph value should be neither too high nor too low, close to the neutral solution with a ph range of (6,9).
Sodium bicarbonate (NaHCO3), commonly known as baking soda.
Small white crystals, less soluble in water than sodium carbonate. It is also a kind of industrial chemical. When the solid is above 50℃, it gradually decomposes into sodium carbonate, carbon dioxide and water, and completely decomposing at 270℃.
Sodium bicarbonate is an acid salt formed by the neutralization of strong base and weak acid. This property enables it to be used as a leavening agent in food preparation.
Sodium bicarbonate will remain after the action, too much use will make the finished product alkali taste.
Chemical properties:
The heat dissolves easily.
To decompose slowly in moist air.
About 50 ℃ start reaction CO2, in all 100 ℃ into sodium carbonate. It is rapidly decomposed in weak acid, and its aqueous solution starts to decompose carbon dioxide and sodium carbonate at 20℃, and all decompose at boiling point.
The unstirred solution made of cold water showed an only slightly alkaline reaction to
phenolphthalein test paper. The pH value of 0.1mol/L aqueous solution prepared at 25℃ is 8.3. Low toxicity, half lethal dose (rats, via mouth)4420mg/kg.
1. Reaction with acid
Reaction with HCl: NaHCO₃+HCl =NaCl+H₂O+CO₂↑
With CH ₃COOH response: NaHCO₃+CH₃COOH=CH₃COONa+H₂O+CO₂↑
2. Reaction with alkali
Reaction with sodium hydroxide: NaHCO₃+NaOH= Na₂CO₃+ H₂O
Reaction with calcium hydroxide: The dose of sodium bicarbonate should be either excessive or small.
A small quantity of: NaHCO₃+ Ca(OH)₂=CaCO₃↓+ NaOH + H₂O
A large quantity of: 2NaHCO₃+ Ca(OH)₂= Na₂CO₃+ CaCO₃↓+ 2H₂O
3. Reaction with salt
Reaction with copper sulfate: 4NaHCO₃+2CuSO₄=2Na₂SO₄+Cu₂(OH)₂CO₃↓+H₂O+3CO₂↑
Hydrolysis
Double hydrolysis with aluminum chloride: 3NaHCO₃+ AlCl₃=Al(OH)₃↓+ 3CO₂↑+ 3NaCl
Double hydrolysis with aluminum sulfate: Al₂(SO₄)₃+6NaHCO₃=3Na₂SO₄+2Al(OH)₃↓+6CO₂↑
4. heating
Thermal decomposition: 2NaHCO₃=Na₂CO₃+ H₂O + CO₂↑
5. ionization
Sodium bicarbonate ionization equation: NaHCO₃=Na+ + HCO₃﹣
Food grade baking soda
Unlike industrial soda (sodium carbonate) and baking soda (sodium bicarbonate), baking soda is made from soda solution or crystals that absorb carbon dioxide.
So, in some places, baking soda is also called edible soda.
Baking soda is solid, round, white, and soluble in water.
The single salt is: positive salt, acid salt, basic salt, sodium bicarbonate is the acid salt formed after neutralization of strong base and a weak acid, which is slightly alkaline when dissolved in water.
In the mass production of steamed buns, deep-fried dough sticks, and other foods, baking soda is often mixed into the flour and decomposed into sodium carbonate, carbon dioxide, and water after heat. When carbon dioxide and water vapor overflow, food will become more fluffy and sodium carbonate will remain in the food.
Steamed bread can be tasted with too much soda added.
USES:
Sodium bicarbonate can be directly used as a raw material in the pharmaceutical industry for the treatment of gastric acid overload.
It can also be used in filmmaking, tanning, dressing, smelting, metal heat treatment, and fiber, rubber industry, etc.
It is also used as a detergent for wool and as a seed soaks for agriculture.
