I believe the molecular equation is what you have already been given: Na2CO3 + CaCl2 --> CaCO3 + 2NaCl. The ionic equation requires you to break these compounds into their ions if they exist in solution: - note: calcium carbonate is insoluble whilst sodium chloride is notThe net ionic equation is the chemical equation that shows only those elements, compounds, and ions that are directly involved in the chemical reaction. Notice that in writing the net ionic equation, the positively-charged silver cation was written first on the reactant side, followed by the negatively-charged chloride anion.
Solubility and Net Ionic Equations. Net ionic equations are useful in that they show only those chemical species participating in a chemical reaction. The key to being able to write net ionic equations is the ability to recognize monoatomic and polyatomic ions, and the solubility rules.