Question

When aqueous solutions of cadmium chloride and sodium sulfide are mixed, a precipitate of cadmium sulfide forms, leaving soluble sodium chloride in

the solution.

Write the molecular equation for the reaction.
Write the ionic equation for the reaction.
Write the net ionic equation for the reaction. ​

Answer 1

The molecular equation is CdCl2(aq) + Na2S(aq) → CdS(s) + 2NaCl(aq). The ionic equation is Cd²⁺(aq) + 2Cl¯(aq) + 2Na⁺(aq) + S²⁻(aq) → CdS(s) + 2Na⁺(aq) + 2Cl¯(aq). The net ionic equation is Cd²⁺(aq) + S²⁻(aq) → CdS(s).

Step-by-step explanation:

The molecular equation for the reaction between cadmium chloride and sodium sulfide can be written as:

CdCl2(aq) + Na2S(aq) → CdS(s) + 2NaCl(aq)

The ionic equation can be written by breaking down the soluble compounds into their respective ions:

Cd²⁺(aq) + 2Cl¯(aq) + 2Na⁺(aq) + S²⁻(aq) → CdS(s) + 2Na⁺(aq) + 2Cl¯(aq)

The net ionic equation can be derived by removing the spectator ions (ions that are present on both sides of the equation) from the ionic equation:

Cd²⁺(aq) + S²⁻(aq) → CdS(s)