Question

Write the net ionic equation for the precipitation reaction that occurs when aqueous solutions of chromium(III) bromide and potassium carbonate are combined. Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed leave it blank. + + + +

Answer 1

Step-by-step explanation:

An ionic equation will be the one in which all the participating species will be present as ions.

The given reaction will be as follows.

`CrBr_(3) + K_(2)CO_(3) \rightarrow Cr_(2)(CO_(3))_(3)(s) + KBr`

Balancing this equation by multiplying
`CrBr_(3)` by 2 and
`K_(2)CO_(3)` by 3 on reactant side. Whereas multiply KBr by 6 on product side.

`2CrBr_(3) + 3K_(2)CO_(3) \rightarrow Cr_(2)(CO_(3))_(3)(s) + 6KBr`

Hence, the net ionic equation will be as follows.

`2Cr^(3+)(aq) + 3CO^(2-)_(3)(aq) + 6K^(+) + 6Br^(-) \rightarrow Cr_(2)(CO_(3))_(3)(s) + 6K^(+) + 6Br^(-)`

As both
`K^(+)` and
`Br^(-)` are spectator ions. Hence, the net ionic equation will be as follows.

`2Cr^(3+)(aq) + 3CO^(2-)_(3)(aq) \rightarrow Cr_(2)(CO_(3))_(3)(s)`