`B(OH)_(3)` accept how many `OH^(-)` ions ?

Options

A. 1
B. 2
C. 3
D. 4

Answer

To determine how many hydroxide ions (OH⁻) the compound B(OH)₃ can accept, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of B(OH)₃**:
- B(OH)₃, also known as boric acid, has a trigonal planar structure with boron at the center and three hydroxyl (OH) groups attached to it.

2. **Examine the Boron Atom**:
- Boron has an empty p-orbital and can accept electron pairs. In B(OH)₃, boron has a total of three covalent bonds with the hydroxyl groups and one lone pair of electrons.

3. **Reaction with Hydroxide Ions**:
- When B(OH)₃ interacts with hydroxide ions (OH⁻), the lone pair of electrons on boron can coordinate with an additional hydroxide ion.

4. **Formation of Tetrahydroxyborate Ion**:
- Upon accepting one additional OH⁻ ion, B(OH)₃ transforms into the tetrahydroxyborate ion, [B(OH)₄]⁻. This ion has a tetrahedral geometry, with four hydroxyl groups bonded to the boron atom.

5. **Conclusion**:
- Therefore, B(OH)₃ can accept **one hydroxide ion (OH⁻)**.

### Final Answer:
B(OH)₃ accepts **1 OH⁻ ion**.

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