Chemical formula for in iron(III) hexacyanoferrate(II) is

Options

A. `Fe^3^+[Fe(CN)_(6)]^4^-`
B. `Fe_(3)[Fe(CN)_(6)]`
C. `Fe_(3)[Fe(CN)_(6)]_(4)`
D. `Fe_(4)[Fe(CN)_(6)]^(3)`

Explanation

To determine the chemical formula for iron(III) hexacyanoferrate(II), we can follow these steps:

### Step 1: Identify the oxidation states
The name "iron(III)" indicates that iron (Fe) has an oxidation state of +3. The "ferrate(II)" indicates that the other iron in the complex has an oxidation state of +2.

**Hint:** Look for the oxidation states indicated in the name of the compound.

### Step 2: Identify the ligands and their counts
The term "hexacyano" indicates that there are six cyanide (CN⁻) ligands. The prefix "hexa-" means six.

**Hint:** Pay attention to the prefixes in the name to determine the number of ligands.

### Step 3: Write the formula for the anionic part
The anionic part is derived from the ligands and the oxidation state of the metal. Since there are six cyanide ligands, the charge contributed by the cyanide ligands is -6 (since each CN⁻ has a charge of -1). Therefore, the anionic part can be represented as [Fe(CN)₆] with a total charge of -4 (since the overall charge of the complex must balance with the +3 from iron(III)).

**Hint:** Combine the ligands with their charges to form the anionic part of the complex.

### Step 4: Combine the cationic and anionic parts
The cationic part is Fe³⁺ (from iron(III)), and the anionic part is [Fe(CN)₆]⁴⁻ (from hexacyanoferrate(II)). To write the complete formula, we combine these two parts.

**Hint:** Ensure that the total charge of the complex is neutral when combining cationic and anionic parts.

### Step 5: Write the final formula
The final formula for iron(III) hexacyanoferrate(II) can be represented as:
\[ \text{Fe}^{3+}[\text{Fe(CN)}_6]^{4-} \]
This can be simplified to:
\[ \text{Fe}_3[\text{Fe(CN)}_6]_2 \]

**Hint:** Check if the charges balance out to zero when writing the final formula.

### Final Answer
The chemical formula for iron(III) hexacyanoferrate(II) is:
\[ \text{Fe}_3[\text{Fe(CN)}_6]_2 \]