Will a precipitate form when an aqueous solution of (NH4)4CO3 is mixed with Fe(NO3)3
See your post above.
To determine if a precipitate will form when an aqueous solution of (NH4)4CO3 is mixed with Fe(NO3)3, we need to consider if a reaction will occur between these two compounds and if the products of the reaction are insoluble in water.
(NH4)4CO3 is ammonium carbonate, which is a soluble compound in water. Fe(NO3)3 is iron(III) nitrate, which is also soluble in water.
When these compounds are mixed together, a double displacement reaction occurs. In the reaction, the cations (+ charged ions) and anions (- charged ions) switch partners to form new compounds.
(NH4)4CO3 + Fe(NO3)3 → (NH4)NO3 + FeCO3
The reaction product of this reaction is (NH4)NO3, which is ammonium nitrate. Ammonium nitrate is also soluble in water, so it remains dissolved.
However, the other product of the reaction is FeCO3, which is iron(II) carbonate. Iron(II) carbonate is insoluble in water and can form a precipitate.
So, when an aqueous solution of (NH4)4CO3 is mixed with Fe(NO3)3, a precipitate of FeCO3 should form.