Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper (II) nitrate are mixed. Group of answer choices Li (aq) SO42 - (aq) Cu (aq) NO3 - (aq) CuS (s) Li (aq) NO3 - (aq) Li (aq) S - (aq) Cu (aq) NO3 - (aq) CuS (s) LiNO3 (aq) 2 Li (aq) S2 - (aq) Cu2 (aq) 2 NO3 - (aq) Cu2 (aq) S2 - (aq) 2 LiNO3 (s) 2 Li (aq) S2 - (aq) Cu2 (aq) 2 NO3 - (aq) CuS (s) 2 Li (aq) 2 NO3 - (aq) No reaction occurs.

2Li⁺ (aq) + S²⁻ (aq) + Cu²⁺ (aq) + 2NO₃⁻ (aq) ⟶ 2Li⁺ (aq) + 2NO₃⁻ (aq) + CuS (s)

Explanation:

An ionic equation uses the symbols (aq) [aqueous] to indicate ions that are soluble in water and (s) [solid] to indicate insoluble solids.

In this equation, aqueous lithium sulfide might react with aqueous copper (II) nitrate to form lithium nitrate and copper (II) sulfide.

1. Possible molecular equation

Li₂S (aq) + Cu (NO₃) ₂ (aq) ⟶ 2LiNO₃ + CuS

2. Ionic equation

Nitrates and the salts of Group 1 metals are soluble, so LiNO₃ is soluble.

Sulfides are usually insoluble, so CuS is a precipitate.

We write the formulas of soluble salts as ions, and those of insoluble salts in the "molecular" form.

The complete ionic equation is

2Li⁺ (aq) + S²⁻ (aq) + Cu²⁺ (aq) + 2NO₃⁻ (aq) ⟶ 2Li⁺ (aq) + 2NO₃⁻ (aq) + CuS (s)