H2CO3 (aq) decomposes to H2O (l) and CO2 (g). I know that the carbonic acid quickly decomposes into: H2CO3 (aq) --> H2O(l) + CO2(g) but im unsure of which chemical equation to use for the complete and net ionic equations. I think the main confusion you're having here is that you misinterpretted the composition of the system at the first end point. Looks like you need the products as well as the net ionic equations. What is the total ionic equation and net ionic equation of this equation? Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored. The second reaction is a precipitation reaction, since BaCO3 is not soluble. Explanation: Ionic equation is defined as the equation in which all the chemical species are written in ions. Na2CO3 reacts with HCl in the chemical equation: Na2CO3(s) + 2 HCl(aq) = CO2(g) + H2O(l) + 2 NaCl(aq). One molecule of Na2CO3 (sodium carbonate) combines with two molecules of hydrochloric acid (HCl) to produce one molecule each of carbon dioxide and water, plus two molecules of sodium chloride. The balanced equation will appear above. First the products. Na2CO3(aq) + HCl(aq) => NaCl(aq) + H2O(l) + CO2(g) The first is an acid-base reaction that forms carbonic acid, H2CO3 (aq), which is unstable. Formula Equation: 2 HCl (aq) + Na2CO3 (aq) → 2 NaCl(aq) + CO2 (g) + H2O (l) Ionic Equation: 2 H+ (aq) + CO32- (aq) → H2O (l) + CO2 (g) RomeliaThurston RomeliaThurston Answer: The net ionic equation for the given reaction is written below. HCl (aq) + NaHCO3 (aq) ---> NaCl (aq) + H2O (l) + CO2 (g) Total Ionic Equation. Molecular Equation. Na2CO3(aq) + 2HCl(aq) --> 2NaCl(aq) + H2CO3(aq) I have to write the Complete Ionic equation, spectator ions and Net Ionic equation. While you are correct that an equivalent non-equilibrium system is just all $\ce{HCO3-}$, it is not correct to think of this as an acid.This is bicarbonate. balance and get the net ionic equation for CaCO3(s)+HCl(aq)-->CaCl2(aq)+H2)(l)+Co2(g)? To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. Decide what type of reaction each one is to find the products. The original one or the decomposed H2CO3? Use uppercase for the first character in the element and lowercase for the second character.