What is Sodium Carbonate Na2CO3 Properties Preparation Reactions and Uses
What is Sodium Carbonate?
It is a crystalline compound with the formula Na2CO3. It's popularly referred to as sodium carbonate and also referred to as sodium carbonate and soda crystals. Sodium carbonate is extracted from trona. It's the foremost important component of all essential heavy metals. They're white, water-soluble salts that yield alkaline solutions in water. It is produced during a tremendous amount from common salt and limestone with the help of the Solvay process. In the past, it had been extracted from the ashes of plants growing in sodium-rich soils and so it was known as soda-ash. It is often found in several structures.
Synthesis of Washing Soda, Na2CO3
Sodium carbonate is formed on an industrial scale by the Solvay process. It also can be manufactured by various other processes, just like the Leblanc process, Electrolytic method, Hou's process, etc. It also can be mined from several other areas.
Solvay process, also referred to as the ammonia-rich process, is the most economical process than other processes. The reactants involved during this process are ammonia, brine solution, and limestone. They're affordable and readily available. During this process, salt may be a necessary by-product obtained.
The reactions are:
2NH3 + H2O + CO2 → (NH4)2CO3
(NH4)2CO3 + H2O + CO2 → 2NH4HCO3
To the above product obtained, common salt is added, which ends up within the precipitation of sodium bicarbonate, which is least soluble and is filtered off later.
NH4HCO3 + NaCl → NH4Cl + NaHCO3
Sodium bicarbonate NaHCO3 is then heated to supply bicarbonate of soda Na2CO3, and CO2 gas is evolved, which may be reused again.
2 NaHCO3 → Na2CO3 + CO2 + H2O
Applications of Washing Soda - Na2CO3
Some of them include:
It is employed within the domestic purposes for the manufacture of detergents, soaps, and paper.
It is often used as a softener.
Also utilized in obtaining soluble glass, borax, sodium orthophosphate, and lots of other sodium compounds.
Uses of Washing Soda - Na2CO3
It is used as:
A pH modifier
A foaming agent in toothpaste
A wetter within the brick industry
A laboratory reagent to standardize acids.
An analytical reagent.
Properties of Washing Soda
Formula: Na2CO3
Molar mass: 105.9888 g/mol
Density: 2.54 g/cm3 at 25 °C
Melting point: 851 °C
Chemical Properties of Washing Soda
1. Anhydrous washing soda is stable towards heat.
2. washing soda is mildly alkaline within the aqueous state thanks to hydrolysis, which releases OH–(aq) ions.
Na2CO3(s) + 2H2O(l) à H2CO3(aq) + 2Na+(aq) + 2OH–(aq)
3. It reacts with CO2 from the air forming sodium bicarbonate.
Na2CO3(aq) + H2O + CO2(g) à 2NaHCO3(aq)
4. It reacts with weak vegetable acids liberating CO2.
Na2CO3(aq) + 2H+(aq) à 2 Na+(aq) + H2O(l) + CO2(g)
Na2CO3 + 2HCl à 2 NaCl+ H2O + CO2
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Sodium Bicarbonate Formula
It is a white-coloured solid compound with the formula NaHCO3. It's also referred to as bicarbonate of soda or bicarbonate of soda. It's crystalline but often appears as a fine powder. It is found dissolved in many mineral springs and is a component of natron minerals.
Sodium bicarbonate (NaHCO3) is an acid salt, and washing soda (Na2CO3) is the normal salt of acid (H2CO3).
Carbonic acid may be an acid because it has two replaceable hydrogen atoms in its molecule. When one hydrogen is replaced by reacting it with a limited amount (1 mol) of caustic soda, we get the bicarbonate.
NaOH + H2CO3 à NaHCO3 + H2O
Sodium bicarbonate contains one hydrogen because the dibasic parent acid isn't fully neutralized. Such a sort of salt is named an acid salt. It'll be completely neutralized when it reacts with more caustic soda to make the carbonate, the traditional salt.
NaHCO3 + NaOH à Na2CO3 + H2O
When the two above equations are combined, we get the general equation for the entire neutralization of an acid by the alkali to make the traditional salt.
H2CO3 + 2 NaOH à Na2CO3 + 2 H2O
So, we will say that the bicarbonate may be a kind of intermediate salt formed when an alkali partly neutralizes acid (a dibasic acid).
Similarly, sodium bisulfate, NaHSO4, is the acid salt, and sodium sulfate, Na2SO4, the traditional salt of vitriol and caustic soda.
Solved Problems
1. What's Anhydrous Sodium Carbonate?
Hydrated washing soda has the formula Na2CO3.nH20. 0n strong heating, hydrated washing soda decomposes completely into the water, and anhydrous washing soda, Na2CO3
FAQs on Sodium Carbonate Na2CO3 Complete Chemistry Guide
1. What is sodium carbonate (Na2CO3)?
Sodium carbonate (Na2CO3) is an inorganic ionic compound commonly known as washing soda or soda ash. It consists of two sodium ions (Na+) and one carbonate ion (CO32−).
- Chemical formula: Na2CO3
- Type of compound: ionic salt
- Nature in water: forms an alkaline solution
- Common forms: anhydrous Na2CO3 and decahydrate Na2CO3·10H2O
It is widely used in glass manufacturing, detergents, and water softening.
2. What is the chemical formula and molar mass of sodium carbonate?
The chemical formula of sodium carbonate is Na2CO3 and its molar mass is 105.99 g/mol.
- Na: 2 × 22.99 = 45.98 g/mol
- C: 12.01 g/mol
- O: 3 × 16.00 = 48.00 g/mol
- Total = 45.98 + 12.01 + 48.00 = 105.99 g/mol
For washing soda (Na2CO3·10H2O), the molar mass is approximately 286.14 g/mol.
3. Why is sodium carbonate alkaline in water?
Sodium carbonate is alkaline because the carbonate ion (CO32−) undergoes hydrolysis in water to produce hydroxide ions (OH−).
- Dissociation: Na2CO3(s) → 2Na+(aq) + CO32−(aq)
- Hydrolysis: CO32−(aq) + H2O(l) ⇌ HCO3−(aq) + OH−(aq)
The formation of OH− ions makes the solution basic, giving sodium carbonate its alkaline nature.
4. How is sodium carbonate prepared by the Solvay process?
Sodium carbonate is industrially prepared by the Solvay process, which converts sodium chloride into sodium carbonate using ammonia and carbon dioxide.
- Formation of sodium hydrogen carbonate:
NaCl(aq) + NH3(aq) + CO2(g) + H2O(l) → NaHCO3(s) + NH4Cl(aq) - Thermal decomposition:
2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)
The CO2 and NH3 are recycled, making the process economically efficient.
5. What happens when sodium carbonate reacts with hydrochloric acid?
Sodium carbonate reacts with hydrochloric acid to form sodium chloride, water, and carbon dioxide gas.
- Balanced equation:
Na2CO3(aq) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + CO2(g) - Type of reaction: acid–carbonate reaction
- Observation: effervescence due to CO2 gas
This reaction is commonly used to test for carbonate ions.
6. What is the difference between sodium carbonate and sodium bicarbonate?
The main difference is that sodium carbonate (Na2CO3) contains the carbonate ion (CO32−), while sodium bicarbonate (NaHCO3) contains the hydrogen carbonate ion (HCO3−).
- Na2CO3: stronger base, washing soda
- NaHCO3: weaker base, baking soda
- Na2CO3 has higher alkalinity than NaHCO3
Both are sodium salts of carbonic acid but differ in basic strength and applications.
7. What are the common uses of sodium carbonate?
Sodium carbonate is mainly used in glass manufacturing, detergents, and water softening.
- Manufacture of soda-lime glass
- Ingredient in detergents and cleaning agents
- Softening hard water by removing Ca2+ and Mg2+
- pH regulation in swimming pools and laboratories
Its alkaline nature makes it valuable in both industrial and household applications.
8. How does sodium carbonate soften hard water?
Sodium carbonate softens hard water by precipitating calcium and magnesium ions as insoluble carbonates.
- With calcium ions:
Na2CO3(aq) + CaCl2(aq) → CaCO3(s) + 2NaCl(aq) - With magnesium ions:
Na2CO3(aq) + MgCl2(aq) → MgCO3(s) + 2NaCl(aq)
The insoluble CaCO3 and MgCO3 precipitate out, removing hardness from water.
9. What is washing soda and how is it related to sodium carbonate?
Washing soda is the decahydrate form of sodium carbonate with the formula Na2CO3·10H2O.
- Formed by crystallizing Na2CO3 from water
- Contains 10 molecules of water of crystallization
- Used as a cleaning and water-softening agent
On heating, washing soda loses water and forms anhydrous sodium carbonate.
10. What happens when sodium carbonate is heated?
Anhydrous sodium carbonate (Na2CO3) is thermally stable and does not decompose easily on heating.
- No decomposition under normal laboratory heating
- Washing soda first loses water of crystallization:
Na2CO3·10H2O(s) → Na2CO3(s) + 10H2O(g)
Thus, heating mainly removes water from hydrated sodium carbonate rather than decomposing the carbonate itself.
