# Write the balanced net ionic equation for the reaction that occurs in the following case: Cr2(SO4)3(aq)+(NH4)2CO3(aq)→ ?

## Part A Express your answer as a balanced net ionic equation. Identify all of the phases in your answer. Part B Identify the spectator ion or ions in this reaction. Express your answer as an ion. If there is more than one answer, separate them by a comma.

$C {r}_{2} {\left(S {O}_{4}\right)}_{3} \left(a q\right) + 3 {\left(N {H}_{4}\right)}_{2} C {O}_{3} \left(a q\right) \rightarrow {\left(N {H}_{4}\right)}_{2} S {O}_{4} \left(a q\right) + C {r}_{2} {\left(C {O}_{3}\right)}_{3} \left(s\right) \downarrow$
$A .$ $2 C {r}^{3 +} + 3 C {O}_{3}^{2 -} \rightarrow C {r}_{2} {\left(C {O}_{3}\right)}_{3} \left(s\right) \downarrow$ is the net ionic equation.
$B .$ The spectator ions are $\text{ammonium ion}$, $N {H}_{4}^{+}$, and $\text{sulfate ion}$, $S {O}_{4}^{2 -}$, which do not take part in the reaction, and remain in aqueous solution.