how is sodium bicarbonate prepared in laboratories ?

Answer 1

Sodium bicarbonate is made in the lab by bubbling CO2 for some time through a concentrated solution in water of sodium hydroxide or sodium carbonate. In the latter case, the reaction takes place more quickly.

CO2 + H2O + Na2CO3 ------> 2NaHCO3

With sodium hydroxide:
2NaOH + CO2 -------> Na2CO3 + H2O
Then: Na2CO3 + H2O + CO2 -------> 2NaHCO3

Sodium bicarbonate formed is deposited as a white powder and is filtered off, washed 2-3 times with cold distilled water and then left to dry.

Answer 2

Sodium bicarbonate NaHCO3, or sodium hydrogen carbonate, also known as baking soda and bicarbonate of soda, is a soluble white anhydrous or crystalline chemical compound, with a slight alkaline taste resembling that of sodium carbonate. It is found in many mineral springs and also produced artificially.

Sodium bicarbonate, when exposed to an acid, releases carbon dioxide and water:

NaHCO3 + HCl → NaCl + H2O + CO2 (gas)
NaHCO3 + CH3COOH → NaCH3COO + H2O + CO2 (gas)
Above 60°C, it gradually decomposes into sodium carbonate, water and carbon dioxide:

2NaHCO3 → Na2CO3 + H2O + CO2

Answer 3

You don't need to! Just buy it from your local grocery store.