Write two uses of sodium hydroxide.

Explanation

**Step-by-Step Solution:**

1. **Identify Sodium Hydroxide:**
Sodium hydroxide is a chemical compound with the formula NaOH. It is a white crystalline solid at room temperature and is known for its strong alkaline properties.

2. **First Use - Soap Making:**
One of the primary uses of sodium hydroxide is in the production of soap. It acts as a key ingredient in the saponification process, where it reacts with fats and oils to produce soap. This process involves the hydrolysis of fats and oils, resulting in the formation of glycerol and fatty acid salts, which are the main components of soap.

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