The correct redox equation for the reaction of iron(II) ions with acidified dichromate ions is:
A) $Cr_2O_7^{2-}(aq) + 14H^+(aq) + Fe^{2+}(aq) \rightarrow 2Cr^{3+}(aq) + 7H_2O(l) + Fe(s)$
B) $Cr_2O_7^{2-}(aq) + 14H^+(aq) + Fe^{2+}(aq) \rightarrow 2Cr^{2+}(aq) + 7H_2O(l) + Fe^{3+}(aq)$
C) $Cr_2O_7^{2-}(aq) + 14H^+(aq) + 6Fe^{2+}(aq) \rightarrow 2Cr^{3+}(aq) + 7H_2O(l) + 6e^-$
D) $Cr_2O_7^{2-}(aq) + 14H^+(aq) + 6Fe^{2+}(aq) \rightarrow 2Cr^{3+}(aq) + 7H_2O(l) + 6Fe^{3+}(aq)$ - Scottish Highers Chemistry - Question 5 - 2022
Question 5
The correct redox equation for the reaction of iron(II) ions with acidified dichromate ions is:
A) $Cr_2O_7^{2-}(aq) + 14H^+(aq) + Fe^{2+}(aq) \rightarrow 2Cr^{3+}(... show full transcript
Worked Solution & Example Answer:The correct redox equation for the reaction of iron(II) ions with acidified dichromate ions is:
A) $Cr_2O_7^{2-}(aq) + 14H^+(aq) + Fe^{2+}(aq) \rightarrow 2Cr^{3+}(aq) + 7H_2O(l) + Fe(s)$
B) $Cr_2O_7^{2-}(aq) + 14H^+(aq) + Fe^{2+}(aq) \rightarrow 2Cr^{2+}(aq) + 7H_2O(l) + Fe^{3+}(aq)$
C) $Cr_2O_7^{2-}(aq) + 14H^+(aq) + 6Fe^{2+}(aq) \rightarrow 2Cr^{3+}(aq) + 7H_2O(l) + 6e^-$
D) $Cr_2O_7^{2-}(aq) + 14H^+(aq) + 6Fe^{2+}(aq) \rightarrow 2Cr^{3+}(aq) + 7H_2O(l) + 6Fe^{3+}(aq)$ - Scottish Highers Chemistry - Question 5 - 2022
Step 1
Identify the Redox Reaction
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Answer
The question requires identifying the correct redox reaction involved in the reaction between iron(II) ions and dichromate ions.
Step 2
Analyze the Given Options
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Answer
We need to analyze each of the options (A, B, C, D) carefully to determine which one correctly represents the balanced redox equation.
Step 3
Determine Oxidation and Reduction
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Answer
In the redox reaction:
Iron(II) ions (Fe2+) are oxidized to iron(III) ions (Fe3+), gaining an electron.
Dichromate ions (Cr2O72−) are reduced to chromium(III) ions (Cr3+).
Step 4
Identify the Correct Answer
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Answer
After analyzing the equations, the correct equation is D, since it shows the proper balance of chromium, water, and the transfer of electrons, confirming iron oxidation and dichromate reduction.
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