Questions: 5. Iron(III) ions are changed into iron(II) ions with different reducing agents in Part II. What did you observe when potassium ferricyanide is mixed with the iron(II) ion? What did you observe when potassium ferricyanide is mixed with the iron(III) ion?

5. Iron(III) ions are changed into iron(II) ions with different reducing agents in Part II. What did you observe when potassium ferricyanide is mixed with the iron(II) ion? What did you observe when potassium ferricyanide is mixed with the iron(III) ion?

Transcript text: 5. Iron(III) ions are changed into iron(II) ions with different reducing agents in Part II. What did you observe when potassium ferricyanide is mixed with the iron(II) ion? What did you observe when potassium ferricyanide is mixed with the iron(III) ion?

Solution

Solution Steps

Step 1: Understanding the Reaction with Iron(II) Ions

When potassium ferricyanide (\(\text{K}_3\text{Fe(CN)}_6\)) is mixed with iron(II) ions (\(\text{Fe}^{2+}\)), a chemical reaction occurs where the iron(II) ions are oxidized to iron(III) ions, and the ferricyanide is reduced to ferrocyanide (\(\text{Fe(CN)}_6^{4-}\)). This reaction typically results in the formation of a blue precipitate known as Turnbull's blue (\(\text{Fe}_3[\text{Fe(CN)}_6]_2\)).

Step 2: Understanding the Reaction with Iron(III) Ions

When potassium ferricyanide is mixed with iron(III) ions (\(\text{Fe}^{3+}\)), there is no significant reaction because both species are already in their oxidized forms. Therefore, no color change or precipitate formation is observed.

Final Answer

When potassium ferricyanide is mixed with iron(II) ions, a blue precipitate (Turnbull's blue) is observed.
When potassium ferricyanide is mixed with iron(III) ions, no significant reaction or color change is observed.

\[ \boxed{\text{Blue precipitate with Fe}^{2+}, \text{no reaction with Fe}^{3+}} \]

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