Zeta potential is the potential difference between

Options

A. Any two colloidal particles having opposite
charges
B. The fixed layer and the diffused layer having same
charges
C. The layer of adorbed ions and the mobile layer
having opposite charges
D. Two colloidal layers having same charges

Answer

To answer the question "Zeta potential is the potential difference between," we can break down the concept into clear steps:

### Step-by-Step Solution:

1. **Understanding Adsorption**:
- In surface chemistry, adsorption refers to the accumulation of molecules from a gas, liquid, or dissolved solid onto a surface. This can lead to the formation of layers of charged particles.

2. **Formation of Layers**:
- When a solid surface is immersed in a liquid, it can attract ions from the solution, leading to the formation of two distinct layers:
- **Fixed Layer**: This is the layer of ions that are strongly adsorbed onto the surface of the solid.
- **Mobile Layer (Diffused Layer)**: This layer consists of ions that are loosely associated with the fixed layer and can move more freely.

3. **Charge Distribution**:
- The fixed layer and the mobile layer typically carry opposite charges. For example, if the fixed layer has a negative charge, the mobile layer will have a positive charge, and vice versa.

4. **Zeta Potential**:
- The zeta potential is defined as the potential difference between the fixed layer (where the charge is firmly attached to the surface) and the mobile layer (where the charge is more diffuse). This potential difference is crucial as it influences the stability of colloidal dispersions.

5. **Conclusion**:
- Therefore, the zeta potential is the potential difference between the layer of adsorbed ions (fixed layer) and the mobile layer of ions that are diffused in the solution.

### Final Answer:
Zeta potential is the potential difference between the fixed layer of adsorbed ions and the mobile layer of diffused ions.

---