Formulae of sodium sulphite and sodium sulphate are, respectively _________ and _________ .

Explanation

To find the formulae of sodium sulphite and sodium sulphate, we need to identify the ions involved and their respective charges. Let's break down the solution step by step.

### Step-by-Step Solution:

1. **Identify the Ions**:
- Sodium ion (Na⁺)
- Sulfate ion (SO₄²⁻) for sodium sulphate
- Sulphite ion (SO₃²⁻) for sodium sulphite
...