# 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 $\ce{FeCl3}$:

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

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)?

• I can't see how reducing it would be a problem – Mithoron Oct 12 '15 at 14:37
• Also, $\ce{Fe2(CO3)3}$ does not really exist. – Ivan Neretin Oct 12 '15 at 14:40
• @Mithoron could you please explain how I could reduce it? – Gaurang Tandon Oct 12 '15 at 16:08
• @IvanNeretin It doesn't really exist? How? Why? – Gaurang Tandon Oct 12 '15 at 16:08
• Being a salt of a weak acid and a weak base, it hydrolizes instantly and completely upon mixing. But that shouldn't bother us, for we don't need it anyway. We need $\ce{FeCO3}$; it is more or less OK. – Ivan Neretin Oct 12 '15 at 16:40

$$\ce{2FeCl3 + 2H2O + SO2 -> 2FeCl2 + H2SO4 + 2HCl}$$
$$\ce{FeCl2 + Na2CO3 -> FeCO3 + 2NaCl}$$
• Welcome to Chemistry.SE! Take the tour to get familiar with this site. Mathematical expressions and equations can be formatted using $\LaTeX$ syntax. For more information in general have a look at the help center. At the moment this reads more like a comment than an actual answer - could you elaborate a little more. With a bit more rep, you will be able to post comments on any question/answer. – Martin - マーチン Feb 16 '16 at 11:18