How to prepare iron(II) carbonate from iron(III) chloride? Now, this is an awkward reaction first of all. I know how to prepare $\ce{Fe2(CO3)3}$ from $\ce{FeCl3}$:

$$\ce{2FeCl3 + 3Na2CO3 -&gt; 6NaCl + Fe2(CO3)3}$$

But the question is asking for $\ce{FeCO3}$. It seems to be an impossible task but since this was asked in a public examination, does anybody know how to prepare $\ce{FeCO3}$ from $\ce{FeCl3}$ (in one, two or three reactions)?
$$\ce{2FeCl3 + 2H2O + SO2 -&gt; 2FeCl2 + H2SO4 + 2HCl}$$

$$\ce{FeCl2 + Na2CO3 -&gt; FeCO3 + 2NaCl}$$