Question

What happens when aqueous solutions of calcium chloride and of sodium carbonate are mixed?

Answer 1

A double replacement reaction takes place.

Explanation:

Calcium chloride, `"CaCl"_2`, a soluble ionic compound, and sodium carbonate, `"Na"_2"CO"_3`, also a soluble ionic compound, will react to form calcium carbonate, `"CaCO"_3`, an insoluble solid that precipitates out of solution, and sodium chloride, another soluble ionic compound.

The balanced chemical equation for this double replacement reaction looks like this

`"CaCl"_text(2(aq]) + "Na"_2"CO"_text(3(aq]) -> "CaCO"_text(3(s]) darr + 2"NaCl"_text((aq])`

Once you mix the two aqueous solutions, a white insoluble solid, calcium carbonate, will precipitate out of solution.

The net ionic equation for this reaction looks like this

`"Ca"_text((aq])^(2+) + "CO"_text(3(aq])^(2-) -> "CaCO"_text(3(s]) darr`