Question

Does a reaction occur when aqueous solutions of chromium(III) sulfate and sodium carbonate are combined?

If a reaction does occur, what is the net ionic equation.

Answer 1

When an aqueous solution of chromium(III) sulfate and sodium carbonate are combined a double displacement reaction takes place.

The possible double displacement products are chromium(III) carbonate and sodium sulfate.

From the solubility chart, the product chromium(III) carbonate is insoluble in water thus the reaction occurs.

The balanced molecular equation is as follows:

Cr₂(SO₄)₃(aq) + 3Na₂CO₃(aq) $\rightarrow$ Cr₂(CO₃)₃(s) + 3Na₂SO₄(aq)

The complete ionic equation is as follows:

2Cr³⁺(aq) + 3SO₄^2-(aq) + 6Na⁺(aq) + 3CO₃^2-(aq) $\rightarrow$ Cr₂(CO₃)₃(s) + 6Na⁺(aq) + 3SO₄^2-(aq)

Cancel the spectator ions to write the net ionic equation as follows:

2Cr³⁺(aq) + 3CO₃^2-(aq) $\rightarrow$ Cr₂(CO₃)₃(s) --------- Net ionic equation

Answer 2

Yes

Cr3+(aq) + 3OH-(aq) ----> Cr(OH)3 (s)