What's the ionic equation when Na2CO3 and Ca(NO3)2 react?

Question

i had a look at it but not sure which ions react

Answer 1

Na2 CO3 +  Ca(NO3)2 ------   2 NaNO3 + CaCO3 ( s)

both Na2CO3 and Ca(NO3)2 are soluble while the products , only the NaNO3 is greatly soluble. The solution will turn milky when adding the two together and CaCO3 will precipitate .

2 Na+  +  CO3^-2 + Ca^+2 + 2 NO3^-1 -----  2 Na+ NO3-1 + Ca^+2 + CO3^-2