Explain the function of potasium hexacyanoferrate(lll) solution?
Answer:
Hexacyanoferrate(lll) solution is used to identify the presence of Fe2+ ions in a given compound ( generally a salt sample ).
It is basically a coordination compound used for identification through change in colour. Colour change occurs due to the presence of a transition metal ( actually, empty d orbitals ).
Learn about CFT ( Crystal Field Theory ) and you'll understand the compound's chemistry.
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It used as test on iron(II) ions.
Adding potassium hexacyanoferrate(III) to a solution with iron(II) ions will turn the color to a deep blue.
Iron(II) ions form the with hexacyanoferrate(III) ions a new complex:
Fe²⁺(aq) + [Fe(CN)₆]³⁺(aq) → [FeFe(CN)₆]⁺
The complex forms with the iron(II) and potassium ions in the solution a blue precipitate, known as prussian blue.
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