IUPAC name of `K[BF_(4)]`

Options

A. Potassium tetrafluoroborate
B. Tetrafluoroboron (III) potassium
C. Potassiumtetrafluoridoborate (III)
D. Tetrafluoridoboron (III) potassium

Answer

To determine the IUPAC name of the compound \( K[BF_4] \), we can follow these steps:

### Step 1: Identify the Cation
The cation in this compound is potassium, which is represented by the symbol \( K \).

### Step 2: Identify the Anion
The anion in the complex ion is \( [BF_4]^- \). Here, \( B \) stands for boron, and it is surrounded by four fluorine atoms.

### Step 3: Naming the Anion
The anion \( [BF_4]^- \) is named tetrafluoroborate. The prefix "tetra-" indicates that there are four fluorine atoms bonded to the boron atom.

### Step 4: Combine the Names
In IUPAC nomenclature, the name of the cation is written first, followed by the name of the anion. Therefore, we combine the names we have identified:
- Cation: Potassium
- Anion: Tetrafluoroborate

### Final IUPAC Name
Putting it all together, the IUPAC name of \( K[BF_4] \) is **Potassium tetrafluoroborate**.

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