Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.
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To write the net ionic equation for the precipitation reaction, we first need to write the balanced molecular equation.
The molecular equation for the reaction between ammonium sulfide (NH4)2S and cadmium nitrate Cd(NO3)2 can be written as follows:
(NH4)2S + Cd(NO3)2 → 2NH4NO3 + CdS
To determine the net ionic equation, we need to break down the molecular equation into individual ions and eliminate any spectator ions that do not participate in the reaction.
The dissociation of ammonium sulfide is:
(NH4)2S → 2NH4+ + S2-
The dissociation of cadmium nitrate is:
Cd(NO3)2 → Cd2+ + 2NO3-
In the net ionic equation, we only include the ions that are directly involved in the reaction and exclude the spectator ions. In this case, the ammonium (NH4+) and nitrate (NO3-) ions do not participate in the formation of the precipitate.
Therefore, the net ionic equation for the reaction between ammonium sulfide and cadmium nitrate is:
S2- + Cd2+ → CdS (precipitate)
The net ionic equation shows the specific chemical species that participate in the reaction without including any spectator ions that do not undergo any change.