IUPAC name of `K_3[Al(C_2O_4)_3]` is called

Options

A. (a) potassium alumino oxalato
B. (b) potassium aluminium (III) trioxalate
C. (c) potassium trioxalato aluminate (III)
D. (d) potassium trioxalato aluminate (IV)

Explanation

To determine the IUPAC name of the coordination compound `K_3[Al(C_2O_4)_3]`, we will follow these steps:

### Step 1: Identify the Cation
The cation in this compound is potassium (K). Since there are three potassium ions, we will denote this as "potassium" without indicating the number in the name according to IUPAC naming conventions.

**Hint:** Remember that the number of cations is not indicated in the name.

### Step 2: Identify the Anionic Coordination Complex
The anionic part of the compound is `[Al(C_2O_4)_3]`. Here, `C_2O_4` is the oxalate ligand, which has a charge of -2. Since there are three oxalate ligands, we denote this as "tri" oxalate.

**Hint:** Ligands are named first in the coordination sphere, and their quantity is indicated by prefixes like "mono-", "di-", "tri-", etc.

### Step 3: Name the Central Metal Ion
The central metal ion in this complex is aluminum (Al). Since it is part of an anionic complex, we will use the term "aluminate" for aluminum.

**Hint:** When the metal is part of an anionic complex, the name is modified (e.g., aluminum becomes aluminate).

### Step 4: Determine the Oxidation State of the Metal
To find the oxidation state of aluminum in this complex, we can set up the equation based on the charges:
- The total charge contributed by three oxalate ligands is -6 (since each oxalate is -2).
- Let the oxidation state of aluminum be x. The overall charge of the complex is -3 (since it is an anion).

Thus, we have:
\[ x + (-6) = -3 \]
\[ x = +3 \]

So, the oxidation state of aluminum is +3.

**Hint:** Always balance the charges to find the oxidation state of the central metal ion.

### Step 5: Combine All Parts to Form the Name
Now we can combine all parts to form the complete name:
- Cation: potassium
- Anionic complex: tri oxalate aluminate
- Oxidation state of aluminum: 3

Putting it all together, the IUPAC name of the compound `K_3[Al(C_2O_4)_3]` is:
**Potassium tri oxalate aluminate(III)**

### Final Answer
**The IUPAC name of `K_3[Al(C_2O_4)_3]` is Potassium tri oxalate aluminate(III).**

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