Flocculation value is expressed in terms of

Options

A. Millimoles of electrolyte per litre of solution
B. Motes of electrolyte per litre of solution
C. Gram of electrolyte per litre of solution
D. mMillimoles of electrolyte per millilitre of solution

Answer

**Step-by-Step Solution:**

1. **Understanding Flocculation Value**:
- Flocculation value refers to the minimum concentration of an electrolyte required to cause the precipitation of a colloidal solution (sol). It is a measure of the effectiveness of an electrolyte in inducing coagulation.

2. **Definition**:
- The flocculation value is defined as the minimum concentration of an electrolyte in millimoles per liter (mmol/L) that is necessary to cause the precipitation of a sol within a specific time frame, typically two hours.

3. **Units of Flocculation Value**:
- Since the flocculation value is expressed in terms of concentration, it is measured in millimoles per liter (mmol/L). This indicates the amount of electrolyte needed to achieve the desired coagulation effect.

4. **Coagulation Power**:
- The coagulation power of an ion is inversely related to the flocculation value. This means that the smaller the amount of electrolyte needed to cause coagulation, the higher the coagulation power of that ion. For example, a divalent ion (like magnesium) will have less coagulation power compared to a trivalent ion (like aluminum) when used to flocculate a negatively charged sol.

5. **Conclusion**:
- Therefore, the flocculation value is expressed in terms of millimoles per liter (mmol/L) of the electrolyte.

**Final Answer**: Flocculation value is expressed in terms of millimoles per liter (mmol/L).

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