# Carbonic acid breakup

Hello everyone,

Just one question:
Does carbonic acid always immediately separate into water and carbon dioxide?

I am writing down the reaction equation for HCl(aq) + NaHCO3(s) and HCl(aq) + Na2CO3(aq) that I tested in the lab.
My TA told me carbon dioxide wouldn't form but I don't know why that is, and I keep thinking H2CO3 would break up when it's formed.