"Bi-sodium carbonate" is not a scientifically recognized term. However, it sounds like you might be referring to sodium bicarbonate, also known as baking soda.

Here's why:

* Sodium bicarbonate has the chemical formula NaHCO₃. It's a common household ingredient used in baking, cleaning, and even as an antacid.

* "Bi-" often implies "two" or "double" in chemical naming. However, sodium bicarbonate only has one sodium atom per molecule.

It's possible the term "bi-sodium carbonate" was used incorrectly or is a slang term. If you're unsure about a chemical term, it's always best to rely on official scientific names and resources.