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12AX7
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It doesn't participate. It is precipitated. And Fe2O3 isn't precipitated, Fe(OH)3 is.
The full equation:
Fe(3+)(aq) + 3Cl-(aq) (iron (III) chloride solution) + 3Na+(aq) + OH-(aq) (NaOH solution) = Fe(OH)3(s) + 3Na+(aq) + 3Cl-(aq)
Not counting coordination (ions such as [Fe(H2O)6](3+) (hydrato-), chloro- complexes, and once base is added, hydroxo- complexes as well). Note that
Cl and Na appear on both sides of the equation, so you can write it as Fe(3+) ions combining with OH- ions.
To get Fe2O3 you need to wash, dry and dehydrate (calcine) the product.
Tim
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mericad193724
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thanks for the explanation 12AX7...basically what you are saying is the steel wool and H2O2 is much easier and faster!
Mericad
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12AX7
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I'm confused, where did I say that? It sounds like a waste of H2O2 to me (or bleach, for that route...or ferric chloride for the above!).
Being in water, you'll get hydrated oxides from any rusting anyway. You always need to calcine rust.
Tim
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Twospoons
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| Quote: | Originally posted by 12AX7
To get Fe2O3 you need to wash, dry and dehydrate (calcine) the product.
Tim |
Eh? When I did it I got a fine black ppt of Fe2O3 immediately the two solutions mixed.
I ran FeCl3 soln slowly into boiling NaOH. The ppt was easily separated using a strong magnet - from an old hard drive. The stuff is
incredibly fine, and messy and gets over everything. This was from my attempts to produce a ferromagnetic fluid.
Helicopter: "helico" -> spiral, "pter" -> with wings
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12AX7
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Black?? Black is Fe3O4, which certainly forms from solution with little hydration, but doesn't form from FeCl3 without a reducing agent.
Tim
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Twospoons
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Duh. Should have checked my refs. Fe3O4 (which is actually FeO.Fe2O3 IIRC) was made using a 2:1 molar mix of FeCl3 and FeCl2. I guess my memory aint
what it used to be.
Helicopter: "helico" -> spiral, "pter" -> with wings
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