Question 17
Reaction of Potassium Ferricyanide with Potassium Iodide
When potassium iodide is added to an aqueous solution of potassium ferricyanide, a reversible reaction is observed in which a complex is formed. In a strong acidic medium, the equilibrium shifts completely towards . Addition of zinc chloride to in a slightly acidic medium results in a sparingly soluble complex .
The number of zinc ions present in the molecular formula of is
Detailed Solution
As determined previously, complex is . When zinc chloride () is added to an aqueous solution of in a slightly acidic medium, it forms a sparingly soluble white precipitate of potassium zinc ferrocyanide (). The reaction is:
The molecular formula of complex is . In one molecule of , there are 3 zinc ions (). Therefore, the answer is 3.
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