Comprehension
When potassium iodide is added to an aqueous solution of potassium ferricyanide, a reversible reaction is observed in which a complex P is formed. In a strong acidic medium, the equilibrium shifts completely towards P. Addition of zinc chloride to P in a slightly acidic medium results in a sparingly soluble complex Q.
Question: 1
The number of moles of potassium iodide required to produce two moles of P is ____.
The number of moles of potassium iodide required to produce two moles of P is ____.
Updated On: Mar 9, 2025
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Correct Answer: 2
Solution and Explanation
Reaction and Mole Calculation
Step 1: Reaction Equation
The balanced chemical reaction is:
\[ 2 \text{KI} + 2 \text{K}_3[\text{Fe(CN)}_6] \xrightarrow{\text{H}^+} \text{I}_2 + 2 \text{K}_4[\text{Fe(CN)}_6] \]
Step 2: Mole Calculation
From the reaction, 2 moles of KI react with 2 moles of \( \text{K}_3[\text{Fe(CN)}_6] \) to produce 1 mole of \( \text{I}_2 \) and 2 moles of \( \text{K}_4[\text{Fe(CN)}_6] \).
The stoichiometric ratio between KI and \( \text{K}_3[\text{Fe(CN)}_6] \) is 1:1.
If 2 moles of \( \text{K}_3[\text{Fe(CN)}_6] \) are used, 2 moles of KI are required.
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Question: 2
The number of zinc ions present in the molecular formula of Q is _____.
The number of zinc ions present in the molecular formula of Q is _____.
Updated On: Mar 9, 2025
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Correct Answer: 3
Solution and Explanation
Analysis of Reaction Pathways
Step 1: Analyze the Reaction Pathways
Pathway 1:
\[ \text{K}_4[\text{Fe(CN)}_6] + 3\text{ZnCl}_2 \rightarrow \text{K}_2\text{Zn}_3[\text{Fe(CN)}_6]_2 + 6\text{KCl} \]
In this reaction, 3 zinc ions are incorporated into the product \( \text{K}_2\text{Zn}_3[\text{Fe(CN)}_6]_2 \).
Pathway 2:
\[ \text{K}_4[\text{Fe(CN)}_6] + 2\text{ZnCl}_2 \rightarrow \text{Zn}_2[\text{Fe(CN)}_6] + 4\text{KCl} \]
In this reaction, 2 zinc ions are incorporated into the product \( \text{Zn}_2[\text{Fe(CN)}_6] \).
Final Observation:
The reaction pathway determines whether 2 or 3 zinc ions participate in the formation of the final product.
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