What product is formed by mixing the solution of K4[Fe(CN)6] with the solution of FeCl3:a)Ferro-ferricyanide b)Ferri-ferrocyanide c)Ferri-ferricyanide d)None o f theseCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Formation of Ferri-ferrocyanide

When the solution of K4[Fe(CN)6] (potassium ferrocyanide) is mixed with the solution of FeCl3 (iron(III) chloride), a new product is formed. The product formed is Ferri-ferrocyanide or Iron(III) hexacyanoferrate(II).

Reaction Equation

The reaction can be represented by the following equation:

2K4[Fe(CN)6] + 3FeCl3 → 2Fe4[Fe(CN)6]3 + 12KCl

Explanation

- In the reaction equation, two molecules of potassium ferrocyanide react with three molecules of iron(III) chloride.
- The potassium ferrocyanide contains the Fe(CN)6^-4 ion, which has a central iron atom (II) surrounded by six cyanide ions. Each cyanide ion is bonded to the iron atom through the carbon atom forming a coordination complex.
- The iron(III) chloride contains the Fe3+ ion, which has an empty 3d orbital and can form coordination complexes with the cyanide ions.
- When the two solutions are mixed, the Fe3+ ion from the iron(III) chloride replaces the K+ ion in the potassium ferrocyanide complex ion, forming a new complex ion.
- The new complex ion formed is Ferri-ferrocyanide or Iron(III) hexacyanoferrate(II). It has a central iron atom (III) surrounded by six cyanide ions and four Fe(CN)6^-3 ions.
- The Ferri-ferrocyanide is a dark blue precipitate that is insoluble in water.

Conclusion

The product formed by mixing the solution of K4[Fe(CN)6] with the solution of FeCl3 is Ferri-ferrocyanide or Iron(III) hexacyanoferrate(II). It is a dark blue precipitate that is insoluble in water.

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