What is the correct name for NH4 2CO3?

The correct name for NH₄2CO₃ is Ammonium Carbonate.

Explanation: In this compound, NH₄ represents the ammonium ion, which has a +1 charge. The formula NH₄2CO₃ indicates that there are two ammonium ions (NH₄⁺) combined with one carbonate ion (CO₃^2–). The two positive charges from ammonium balance the two negative charges from the carbonate, resulting in a neutral compound. Ammonium carbonate is commonly used in baking and as a leavening agent.