Which process is used for preparation of sodium carbonate ?

Explanation

To answer the question regarding the process used for the preparation of sodium carbonate, we can break down the solution into clear, step-by-step points.

### Step-by-Step Solution:

1. **Identify the Process**: The primary industrial process used for the preparation of sodium carbonate is known as the **Solvay process**.

2. **Raw Materials**: The Solvay process utilizes several raw materials:
- **Brine solution** (concentrated sodium chloride, NaCl)
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