July 23, 2021, 07:02:37 PM
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Topic: Fe3O4  (Read 551 times)

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Offline Icanfly

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« on: April 28, 2020, 07:59:17 AM »
Hello everyone,

I tried to do the following exercise but I have not be able to answer  to the 4) question. Someone have an idea please?

We want to synthesize Fe3O4:

1) What are the cations present in Fe3O4 and what is their proportion?
This is my answer: we have Fe2+ and Fe3+ more exactly 2 Fe3+ and 1Fe2+

2)What is the hydrolyse balance of (Fe(H2O)6)z+ for the different cations?

(Fe(H2O)6)2+    + H2O = (FeO6H11)+  + H2O
(Fe(H2O)6)3+   + H2O = (FeO6H11)2+  + H2O

3)Calcul the pH for h=1,2 and 3

For (Fe(H2O)6)+2: pH=4,3( h=1), pH=7,1( h=2) and pH=10,2(h=3)

For (Fe(H2O)66)3+: pH=0,9( h=1), pH=3,5( h=2) et pH=6,3( h=3)

4)Which complexe can allow you to obtain Fe3O4 by condensation mechanism in aqueous solution?

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