Which of the following is soluble in acetic acid?

Options

A. `CaCO_(3)`
B. `CaC_(2)O_(4)`
C. `Ca(OH)_(2)`
D. `CaO`

Explanation

To determine which of the given compounds is soluble in acetic acid, we will analyze each compound's properties and how they interact with acetic acid.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds we are considering are:
- Calcium Carbonate (CaCO₃)
- Calcium Oxalate (CaC₂O₄)
- Calcium Hydroxide (Ca(OH)₂)
- Calcium Oxide (CaO)

2. **Understand Acetic Acid**: Acetic acid (CH₃COOH) is a weak acid. It does not fully dissociate in solution, which means it has a limited ability to react with bases.

3. **Analyze Each Compound**:
- **Calcium Carbonate (CaCO₃)**: This compound reacts with acetic acid to produce calcium acetate, carbon dioxide, and water. Therefore, it is soluble in acetic acid.
- **Calcium Oxalate (CaC₂O₄)**: This is a salt formed from calcium hydroxide and oxalic acid. It has high lattice energy and low solvation energy, making it insoluble in acetic acid.
- **Calcium Hydroxide (Ca(OH)₂)**: This strong base reacts with acetic acid to form calcium acetate and water, indicating that it is soluble in acetic acid.
- **Calcium Oxide (CaO)**: This compound also reacts with acetic acid to produce calcium acetate and water, thus it is soluble in acetic acid.

4. **Conclusion**: The compounds that are soluble in acetic acid are:
- Calcium Carbonate (CaCO₃)
- Calcium Hydroxide (Ca(OH)₂)
- Calcium Oxide (CaO)

The only compound that is not soluble in acetic acid is Calcium Oxalate (CaC₂O₄).

### Final Answer:
The compounds that are soluble in acetic acid are Calcium Carbonate (CaCO₃), Calcium Hydroxide (Ca(OH)₂), and Calcium Oxide (CaO).

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