Question #f92f2

Hydrochloric acid, `"HCl"`, is a strong acid that ionizes completely in aqueous solution to form hydronium cations< `"H"_3"O"^(+)`, and chloride anions, `"Cl"^(-)`

`color(red)("H")"Cl"_ ((aq)) + "H"_ 2"O"_ ((l)) -> "H"_ 3"O"_ ((aq))^(color(red)(+)) + "Cl"_((aq))^(-)`

Calcium chloride, `"CaCl"_2`, is a soluble ionic compound that dissociates completely in aqueous solution to form calcium cations, `"Ca"^(2+)`, and chloride anions

`"CaCl"_ (2(aq)) -> "Ca"_ ((aq))^(2+) + "Cl"_((aq))^(-)`

As you can see, both hydrochloric acid and calcium chloride dissociate in aqueous solution. After they dissociate, these ions will continue to exist in solution as such.

Adding calcium chloride to a solution of hydrochloric acid will thus result in a solution that contains `"Ca"^(2+)`, `"H"_3"O"^(+)`, and `"Cl"^(-)`.

These ions will not react with each other in any way, which is why you can say that calcium chloride and hydrochloric acid do not react when mixed.

`"Ca"_ ((aq))^(2+) + "Cl"_ ((aq))^(-) + "H"_ 3"O"_ ((aq))^(+) + "Cl"_((aq))^(-) -> color(red)("no reaction")`

This is of course equivalent to

`"CaCl"_ (2(aq)) + "HCl"_ ((aq)) -> color(red)("no reaction")`