# Does sodium carbonate form a precipiate with iron (III) chloride? [closed]

Students were asked to determine a compound that could be combined with an iron (III) chloride ($\ce{FeCl3}$) solution to react and form a precipitate. A student chose sodium carbonate ($\ce{Na2CO3}$). Is he correct?

• What are your thoughts? Why would/wouldn't sodium carbonate form a precipitate? As this is a homework type of question, it is required that you show your thoughts and efforts toward solving the problems yourself. As it is, the question will be closed. Regardless, welcome to Chemistry.SE and best of luck! – airhuff May 8 '17 at 4:18

Yes, iron(III) chloride reacts with sodium carbonate in aqueous solution to produce iron(III) hydroxide which forms precipitate.

$$\ce{2FeCl3 + 3Na2CO3 + 3H2O → 2Fe(OH)3 + 6NaCl + 3CO2}$$

Iron(III) chloride react with sodium carbonate and water to produce iron(III) hydroxide, sodium chloride and carbon dioxide.(chemiday 1)

Iron(III) hydroxide is insoluble in water.($\ce{K_{sp}=2.79×10^{−39}}$)

Also, some amount of anhydrous iron(III) hydroxide(also called iron(III) oxide-hydroxide) is also produced which is also insoluble.

$$\ce{3Na2CO3 + 2FeCl3 + H2O → 2FeO(OH) + 6NaCl + 3CO2}$$

Sodium carbonate react with iron(III) chloride and water to produce iron(III) oxide-hydroxide, sodium chloride and carbon dioxide. The reaction takes place in a boiling solution.(chemiday 2)