Final answer:
Fe2(CO3)3 is not expected to be soluble in water given the general solubility rules which state carbonates are insoluble except with alkali metals or ammonium, and FeCO3's established very low Ksp indicates poor solubility.
Step-by-step explanation:
The compound Fe2(CO3)3 is not expected to be soluble in water according to solubility rules. Carbonates (CO32-) are generally insoluble except when paired with alkali metal cations or ammonium (NH4+). Iron (II) carbonate (FeCO3), which is related to Fe2(CO3)3, has a very low solubility product constant (Ksp) indicating that it is not very soluble. As iron carbonate forms, the concentration of free iron ions ([Fe2+]) in solution decreases, promoting the formation of a precipitate. Similarly, Fe2(CO3)3 would also be expected to precipitate as it does not fall into the category of soluble carbonates.