write the chemical formula for this (HCl + Sodium Carbonate)

Sure, here is the chemical reaction between Hydrochloric acid (HCl) and Sodium Carbonate (Na2CO3):

HCl + Na2CO3 -> NaCl + H2O + CO2

This is a type of double displacement reaction. Here's the step-by-step process:

1. Hydrochloric acid (HCl) reacts with Sodium Carbonate (Na2CO3) to form Sodium Chloride (NaCl), Water (H2O), and Carbon Dioxide (CO2).
2. The Sodium (Na) in Sodium Carbonate (Na2CO3) swaps places with the Hydrogen (H) in Hydrochloric acid (HCl), forming Sodium Chloride (NaCl).
3. The remaining parts of the molecules combine to form Water (H2O) and Carbon Dioxide (CO2).