What happens when:
`SO_(2)` is passed through limewater.

Explanation

When sulfur dioxide (SO₂) is passed through limewater (which is a solution of calcium hydroxide, Ca(OH)₂), a series of chemical reactions occur. Here’s a step-by-step breakdown of the process:

### Step 1: Understanding the Reactants
- **Limewater** is a dilute solution of calcium hydroxide, Ca(OH)₂.
- **Sulfur dioxide** (SO₂) is a gas that can react with bases.

### Step 2: Initial Reaction
- When SO₂ is introduced to limewater, it reacts with calcium hydroxide:
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