Thermal decomposition of sodium carbonate will produce

• (A) Carbon dioxide
• (B) Oxygen
• (C) Sodium hydroxide
• (D) No other product

The thermal decomposition of sodium carbonate (Na2CO3) is an interesting chemical reaction that occurs when sodium carbonate is heated. The correct answer to your question is (A) Carbon dioxide. Let’s break down the process to understand why this is the case.

What Happens During Thermal Decomposition?

Thermal decomposition is a type of reaction where a compound breaks down into simpler substances when heated. In the case of sodium carbonate, the reaction can be represented as follows:

• Na2CO3 (s) → Na2O (s) + CO2 (g)

When sodium carbonate is heated, it decomposes into sodium oxide (Na2O) and carbon dioxide (CO2). This reaction is significant because it illustrates how certain compounds can break down under heat, releasing gases.

Why Carbon Dioxide is the Main Product

During the decomposition, the carbon dioxide produced is a gas, which can be observed as bubbles or effervescence if the reaction occurs in a solution. The sodium oxide formed is a solid that remains in the reaction mixture. This reaction is a classic example of how carbonates behave when subjected to heat.

Other Products and Misconceptions

It’s important to clarify that sodium hydroxide (NaOH) is not produced in this reaction. Some might confuse the thermal decomposition of sodium carbonate with other reactions involving sodium compounds, but in this specific case, sodium hydroxide does not form. Additionally, oxygen is not a product of this decomposition process.

Real-World Applications

The thermal decomposition of sodium carbonate is not just a theoretical concept; it has practical applications in various industries. For instance, the production of glass often involves sodium carbonate, and understanding its decomposition can help in optimizing processes that require high temperatures.

Summary of Key Points

• The thermal decomposition of sodium carbonate produces sodium oxide and carbon dioxide.
• Carbon dioxide is the gas released during the reaction.
• Sodium hydroxide and oxygen are not products of this decomposition.

In summary, when sodium carbonate is heated, it decomposes to yield carbon dioxide as a primary product, along with sodium oxide. This reaction is a fundamental concept in chemistry that demonstrates the behavior of carbonates under heat.