In a stoichiometric reaction, what is the primary purpose of adding Na2CO3 to the reaction mixture?

• A. To neutralize acidic byproducts formed during the reaction
• B. To provide a source of sodium ions for the reaction
• C. To precipitate metal ions as insoluble carbonates
• D. To act as a catalyst and increase the reaction rate

Answer: (A)

Verified step by step guidance

1. Understand the role of \( \text{Na}_2\text{CO}_3 \) (sodium carbonate) in chemical reactions, especially in stoichiometric contexts.
2. Recall that sodium carbonate is a basic salt that can react with acids to neutralize them, forming water and carbon dioxide or bicarbonate ions.
3. Consider the common issues in reactions where acidic byproducts are formed, which can interfere with the reaction progress or product stability.
4. Recognize that adding \( \text{Na}_2\text{CO}_3 \) helps to neutralize these acidic byproducts, maintaining a suitable pH for the reaction to proceed efficiently.
5. Evaluate other options such as providing sodium ions, precipitating metal ions, or acting as a catalyst, and understand why these are less likely the primary purpose compared to neutralization of acids.