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)

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