Answer to Question #43302 in Inorganic Chemistry for Anissa
I have a solution that contains a mixture or Cr3+ and Fe3+ and the solution is very alkaline.
I want to know the amount of Iron in it, the thing is with Cr3+ it's difficult because it reacts also with the substance I add to titrate.
Is there a way to determine the amount of Iron ions without getting influenced by Cr3+ ?
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Under strong alkaline conditions, the chromium (III) ions turn into hydroxochromate ions and thus remain in the solution:
Cr3+(aq) + 6OH-(aq) --> [Cr(OH)6]3-(aq)
Iron does not show the amphoteric properties under such conditions, so it can be easily separated from mixture:
Fe3+(aq) + 3OH-(aq) --> Fe(OH)3(solid)
Thank you for your answer.
But I was wondering if I precipitate the iron (III) hydroxide I risk to precipitate the Cr (III) hydroxide too.
I don't want that to happen because I want just to know the amount of Iron.