How alkali metal halides can be prepared?

Explanation

To prepare alkali metal halides, several methods can be employed. Here is a step-by-step breakdown of the preparation methods:

### Step 1: Preparation from Alkali Metal Oxides
1. **General Reaction**: When an alkali metal oxide (M2O) reacts with a hydrogen halide (HX), it produces an alkali metal halide (MX) and water (H2O).
- **Equation**: M2O + 2HX → 2MX + H2O
2. **Example**: Sodium oxide (Na2O) reacts with hydrochloric acid (HCl).
- **Reaction**: Na2O + 2HCl → 2NaCl + H2O
- **Result**: Sodium chloride (NaCl) is formed, which is an alkali metal halide.
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