What are the acid and base that react to form NA2CO3?

Question

What are the acid and base that react to form NA2CO3?

Answer 1

carbonic acid  H2CO3

Answer 2

Carbonic acid, H2CO3, and any sodium-containing base.

Either that, or sodium hydroxide and carbon dioxide.

2NaOH + CO2 → Na2CO3 + H2O

Answer 3

Since Na2CO3 contains Na+ ions and CO3(2-) ions, the answer is obtained by adding OH- to Na+ to get NaOH; and adding H+ to CO3(2-) to get H2CO3. This is what you should write down.

However, with a suitable definition of "acid" and "base", we can let Na2O be the base and CO2 be the acid. You may learn about this later on.