What is the complete balance equation for Cal2+Hg(No3)2?

Question

What is the complete balance equation for Cal2+Hg(No3)2?

Answer 1

A solution of calcium iodide will react with mercury (II) nitrate to make a precipitate of mercury (II) iodide, which calcium nitrate is in solution.   HgI2 has a very low solubility.

Cal2(aq) + Hg(NO3)2(aq) --> Ca(NO3)2(aq) + HgI2(s)

In reality, the calcium ions and the nitrate ions are spectator ions and really aren't involved in the reaction.

Ionic equation - you can easily see the spectator ions

Ca2+ + 2I- + Hg2+ + 2 NO3- --> HgI2(s) + Ca2+ + 2 NO3-

Net ionic equation - only the ions that react

Hg2+ + 2I- +  --> HgI2(s)

Answer 2

CaI2  + Hg(NO3)2 -------   Ca(NO3)2  + HgI2 ( s)

This is a double displacement reaction and the mercuric iodide formed is insoluble and falls out of solution as a yellow solid. Ca(NO3)2 is a soluble salt.