Define peptisation.

Explanation

**Step-by-Step Solution:**

1. **Definition of Peptisation**: Peptisation is a process that involves the conversion of a freshly prepared precipitate (ppt) into a colloidal solution.

2. **Formation of Colloidal Solution**: In this process, the freshly prepared precipitate is dispersed in a medium (usually a liquid), resulting in the formation of colloidal particles.

3. **Role of Electrolyte**: The process of peptisation typically requires the addition of a small amount of a suitable electrolyte. This electrolyte helps in stabilizing the colloidal particles and prevents them from aggregating back into larger particles.

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