What is a soft soap ?

Explanation

### Step-by-Step Solution:

1. **Definition of Soft Soap**: Soft soap is a type of soap that is primarily composed of potassium salts of fatty acids. Unlike hard soaps, which are typically sodium salts of fatty acids, soft soaps have a different chemical structure that makes them softer and more soluble in water.

2. **Composition**: Soft soaps are made from long-chain fatty acids such as palmitic acid, stearic acid, and oleic acid. The key characteristic of soft soap is that it contains potassium salts of these fatty acids.

3. **Formation Process**: Soft soaps are generally produced through a process involving the reaction of fatty acids with a suitable base. In the case of soft soap, potassium hydroxide (KOH) is used as the base.

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