II. Ionic Equations 8. Write the complete ionic and net ionic equations for the reaction below:
2 AgNO3(aq) + CaCl2(aq) → 2 AgCl + Ca(NO3)2
Complete ionic:
Net ionic:

Complete ionic: .

Net ionic: .

Explanation:

Start by identifying species that exist as ions. In general, such species include:

All four species in this particular question are salts. However, only three of them are generally soluble in water: , , and . These three salts will exist as ions:

On the other hand, is generally insoluble in water. This salt will not form ions.

Rewrite the original chemical equation to get the corresponding ionic equation. In this question, rewrite , , and (three soluble salts) as the corresponding ions.

Pay attention to the coefficient of each species. For example, indeed each formula unit will exist as only one ion and one ion. However, because the coefficient of in the original equation is two, alone should correspond to two ions and two ions.

Do not rewrite the salt because it is insoluble.

.

Eliminate ions that are present on both sides of this ionic equation. In this question, such ions include one unit of and two units of . Doing so will give:

.

Simplify the coefficients:

.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.