How are soaps different from detergents?
What makes water hard?

Explanation

### Step-by-Step Solution

**1. Definition of Soaps:**
- Soaps are defined as sodium or potassium salts of carboxylic acids that are attached to long aliphatic chains.
- Example: Sodium stearate is a common soap made from stearic acid.

**2. Definition of Detergents:**
- Detergents are usually sodium or potassium salts of long alkyl chains that terminate with a sulfonate group.
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