Sodium carbonate (Na₂CO₃) is not typically used in the preparation of a thiosulfate solution.

Here's why:

* Thiosulfate solutions are usually prepared from sodium thiosulfate pentahydrate (Na₂S₂O₃·5H₂O). This compound is readily available and dissolves easily in water to form the desired thiosulfate solution.

* Sodium carbonate is a base. While it's a common reagent in chemistry, it wouldn't contribute to forming the thiosulfate ion (S₂O₃²⁻) that is the key component of a thiosulfate solution.

Here's how a thiosulfate solution is typically prepared:

1. Weigh out the desired amount of sodium thiosulfate pentahydrate (Na₂S₂O₃·5H₂O).

2. Dissolve the solid in distilled water.

3. Adjust the volume of the solution to the desired concentration.

Important note: It's crucial to use distilled water to prepare the solution, as impurities in tap water can affect the stability and accuracy of the thiosulfate solution.

Let me know if you have any other questions about thiosulfate solutions or their preparation!