Use solubility rules to write the balanced molecular, complete ionic, and net ionic equations for the aqueous reaction between BaI2 and Hg(NO3)2. Include phase subscripts on all substances.

Question

Use solubility rules to write the balanced molecular, complete ionic, and net ionic equations for the aqueous reaction between BaI2 and Hg(NO3)2.  Include phase subscripts on all substances.

I got to the part where you switch the elements 
Ba(NO3)2 +HgI2 I don't know where to go from there?

DrBob222 · Accepted Answer

Thanks for telling me where you're stuck but why didn't you show what you had done so I could check it first. The molecular equation is as follows:
BaI2(aq) + Hg(NO3)2(aq) ==> HgI2(s) + Ba(NO3)2(aq)

Now change that to a complete ionic equation. The rules are that if it dissolves and ionizes write it as ions, if gas or covalent write as molecule. Write insoluble materials as molecule.

Ba^2+(aq) + 2I^-(aq) + Hg^2+(aq) + 2NO3^-(aq) ==> HgI2(s) + Ba^2+(aq) + 2NO3^-(aq)

Now cancel those ions that occur on both sides. So can cancel Ba^2+ on left and right as well as 2NO3^- on left and right. That leaves the net ionic equation.
2I^-(aq) + Hg^2+(aq) ==> HgI2(s)