Write the balanced net ionic equation for a solution formed from AgNO3 (aq) and K2S (aq)

2Ag⁺ (aq) + S⁻² (aq) → Ag₂S (s)

Explanation:

In order to write the net ionic equation we must know if the reactants make a precipitate

In this case the S⁻² (sulfur) bonds to the Ag⁺ to form the correspond precipitate. The other product is the potassium nitrate.

We dissociate both salts:

AgNO₃ → Ag⁺ + NO₃⁻

K₂S → 2K⁺ + S⁻²

Molecular reaction is: 2AgNO₃ (aq) + K₂ (aq) → Ag₂ (s) ↓ + 2KNO₃ (aq)

The ions are in aqueous solution so we write the phases:

2Ag⁺ (aq) + NO₃⁻ (aq) + 2K⁺ (aq) + S⁻² (aq) → Ag₂S (s) + NO₃⁻ (aq) + 2K⁺ (aq)

We cancel the ions that are repeat because they are spectators, therefore the net ionic equation is:

2Ag⁺ (aq) + S⁻² (aq) → Ag₂S (s)