Question

Co(NO3 )2 (s) +Na2CO3(s)=_________________

Answer 1

\[Co^{2+} + NO_3^{2-} + Na^+ + CO_3^{2-} \rightarrow \]

combine + and - charges.

Answer 2

Sorry it should be \[NO_3^-\]
NOT: \[NO_3^{2-}\] THAT IS WRONG.