Write molecular, ionic, and net-ionic equations for each of the aqueous mixtures

Question

Write molecular, ionic, and net-ionic equations for each of the aqueous mixtures of reagents. Underline all solids. If no reaction occurs, complete the molecular and ionic equations, but write "No Reaction" in place of the net-ionic equation. Include the physical state ((s), (aq), etc.) for all species. ___ Co(NO_3)_2(aq) + ___ NaCl_(aq) rightarrow ionic: net-ionic: ___ Co(NO_3)_2(aq) + ___ NaBr_(aq) rightarrow ionic: net-ionic: ___ Co(NO_3)_2(aq) + ___ Nal_(aq) rightarrow ionic: net-ionic: ___ Co(NO_3)_2(aq) + ___ Na_2CO_3 (aq) rightarrow ionic: net-ionic:

Explanation / Answer

1.

Co(NO3)2 + NaCl --> NR

there is no reaction; all are aquous ions in solution

2.

Co(NO3)2 + NaBr --> NR

there is no reaction; all are aquous ions in solution; since Br and Cl are from the same group

3.

Co(NO3)2 + NaI --> NR

there is no reaction; all are aquous ions in solution; since Br and Cl are from the same group

4.

Co(NO3)2(aq) + Na2CO3(aq) --> CoCO3(s) + 2NaNO3(aq)

Ksp = 10^-10, so there is solid formation

ionic:

Co+2(aq) + 2NO3-(aq) + 2Na+(aq) + CO3-2(aq) --> CoCO3(s) + 2Na+(aq) + 2NO3-(aq)

net ionic

Co+2(aq) + CO3-2(aq) --> CoCO3(s)

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