The name of complex ion, `[Fe(CN_(6))]^(3-)` is

Options

A. hexacyanoiron (III) ion
B. hexacyanitoferrate (III) ion
C. tricyanoferrate (III) ion
D. hexacyanidoferrate (III)ion

Explanation

To name the complex ion \([Fe(CN)_{6}]^{3-}\), we can follow these steps:

### Step 1: Identify the central metal ion and its oxidation state
- The central metal ion is iron (Fe).
- Let the oxidation state of iron be \(x\).
- The cyanide ion (CN) is a ligand with a charge of -1, and there are 6 cyanide ions.
- The overall charge of the complex is -3.

The equation for the oxidation state can be set up as follows:
\[ x + 6(-1) = -3 \]
\[ x - 6 = -3 \]
\[ x = +3 \]
Thus, the oxidation state of iron in this complex is +3.

### Step 2: Identify the ligands and their names
- The ligand here is cyanide (CN).
- Since there are 6 cyanide ligands, we use the prefix "hexa-" to indicate the number of ligands.
- The name of the ligand in the complex is "cyanido".

### Step 3: Combine the ligand names and the central metal ion name
- The name of the complex will start with the number of ligands followed by the name of the metal.
- Since the overall charge of the complex is negative, we use the "-ate" suffix for the metal name.
- The name of iron in the anionic form is "ferrate".

### Step 4: Write the complete name of the complex ion
- Combining all parts, we get:
\[ \text{Hexacyanidoferrate(III) ion} \]

### Final Answer:
The name of the complex ion \([Fe(CN)_{6}]^{3-}\) is **Hexacyanidoferrate(III) ion**.

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