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Topic: What is FeCl3 + HCl --> ?  (Read 44734 times)

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Offline unknown_analysis

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What is FeCl3 + HCl --> ?
« on: January 24, 2011, 08:54:56 AM »
How come the yellow solution, FeCl3, becomes colorless when mixed with HCl? The molar concentration of FeCl3 is 0.05 M and HCl is 0.075 M. What is FeCl3 + HCl --> ? I'm just confused.
I am guessing that the acidity of the solution affects the color of FeCl3? Can anyone help me?

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Offline DevaDevil

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Re: What is FeCl3 + HCl --> ?
« Reply #1 on: January 24, 2011, 10:27:33 AM »
I know that a complex of iron can be formed: FeCl4- when iron chloride is in the presence of excess chloride, but this should have a light yellow color as well.
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Offline AWK

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Re: What is FeCl3 + HCl --> ?
« Reply #2 on: January 25, 2011, 03:03:54 AM »
Water solutions of FeCl3 are brown-yellow because of hydrolysis
Fe(H2O)63+ + H2O = FeOH(H2O)52+ + H3O+
Addition of any strong acid moves this equilibrium to the left. Only at high concentration of HCl tetrachloroferric acid is formed in small amounts though it can be isolated as etherate (C2H5OC2H5)in anhydrous conditions.
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