What is the name of the complex `[Al(OH)_(2)(H_(2)O)_(4)]SO_(4)` ?

Options

A. Bis Tetrahydroxodioxaluminate (III) sulphate
B. Dihydroxotetrahydridoaluminium (III) sulphate
C. Tetraaquodihydroxoaluminium (III) sulphate
D. Tetraaquuolihydroxoaluminium (IV) sulphate

Answer

To name the complex `[Al(OH)₂(H₂O)₄]SO₄`, we will follow the IUPAC naming conventions for coordination compounds. Here’s a step-by-step breakdown of the process:

### Step 1: Identify the Cation and Anion
The complex consists of a cation `[Al(OH)₂(H₂O)₄]` and an anion `SO₄`.

### Step 2: Name the Ligands
- **Neutral Ligand**: Water (H₂O) is a neutral ligand and is named "aqua". Since there are four water molecules, we use the prefix "tetra-". Thus, we have "tetraaqua".
- **Negative Ligand**: Hydroxide (OH⁻) is a negative ligand and is named "hydroxo". Since there are two hydroxide ions, we use the prefix "di-". Thus, we have "dihydroxo".

### Step 3: Name the Central Metal Ion
The central metal ion in this complex is aluminum (Al).

### Step 4: Determine the Oxidation State
Aluminum in this complex has an oxidation state of +3. This is indicated in Roman numerals as "III".

### Step 5: Combine the Names
According to IUPAC naming conventions, we name the ligands first followed by the central metal ion and its oxidation state. Therefore, we combine:
- Ligands: "tetraaqua" and "dihydroxo"
- Metal: "aluminium"
- Oxidation state: "III"

Putting this together, we have "tetraaquadihydroxoaluminium(III)".

### Step 6: Name the Anion
Finally, we add the name of the anion, which is "sulfate" for `SO₄`.

### Final Name
Combining everything, the full name of the complex is:
**tetraaquadihydroxoaluminium(III) sulfate**.

### Summary
The name of the complex `[Al(OH)₂(H₂O)₄]SO₄` is **tetraaquadihydroxoaluminium(III) sulfate**.

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