The cell constant of a conductivity cell

Options

A. change with change of electrolyte
B. changes with change of concentration of electrolyte
C. changes with temperture of electrolyte
D. remains constant for a cell

Answer

To solve the question regarding the cell constant of a conductivity cell, we will follow these steps:

### Step 1: Understand the Concept of Cell Constant
The cell constant (K) of a conductivity cell is defined as the ratio of the distance between the electrodes (L) to the area of cross-section (A) of the electrodes. The formula for cell constant is given by:
\[ K = \frac{L}{A} \]

### Step 2: Analyze the Factors Affecting Cell Constant
From the formula, we can see that the cell constant depends solely on the physical dimensions of the cell:
- **L**: the distance between the electrodes
- **A**: the area of cross-section of the electrodes

### Step 3: Evaluate the Options Given in the Question
1. **Change with the change of electrolyte**: Incorrect, as the cell constant is not influenced by the type of electrolyte used.
2. **Change with the change of concentration of electrolyte**: Incorrect, as the concentration of the electrolyte does not affect the physical dimensions of the cell.
3. **Change with temperature of electrolyte**: Incorrect, as temperature changes do not affect the dimensions of the electrodes.
4. **Remain constant for a cell**: Correct, since the cell constant is determined by the fixed dimensions of the cell.

### Step 4: Conclusion
Based on the analysis, the correct answer is that the cell constant of a conductivity cell remains constant for a cell.

### Final Answer
The cell constant of a conductivity cell remains constant for a cell.

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