The electrode potential becomes equal to standard electrode potential when reactants and products concentaration ratio is .

Options

A. equal to 1
B. greater than 1
C. less than 1
D. none of the above

Explanation

To solve the question regarding when the electrode potential becomes equal to the standard electrode potential, we can use the Nernst equation. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understand the Nernst Equation**:
The Nernst equation relates the electrode potential (E) to the standard electrode potential (E°) and the concentrations of the reactants and products:
\[ E = E° - \frac{0.0591}{n} \log \left( \frac{[\text{Products}]}{[\text{Reactants}]} \right) \]

2. **Set the Condition for Equality**:
According to the question, we need to find when the electrode potential (E) is equal to the standard electrode potential (E°):
\[ E = E° \]

3. **Substitute into the Nernst Equation**:
If we set E equal to E°, the equation becomes:
\[ E° = E° - \frac{0.0591}{n} \log \left( \frac{[\text{Products}]}{[\text{Reactants}]} \right) \]

4. **Simplify the Equation**:
By subtracting E° from both sides, we get:
\[ 0 = -\frac{0.0591}{n} \log \left( \frac{[\text{Products}]}{[\text{Reactants}]} \right) \]

5. **Cross-Multiply**:
This implies:
\[ \frac{0.0591}{n} \log \left( \frac{[\text{Products}]}{[\text{Reactants}]} \right) = 0 \]

6. **Set the Logarithm to Zero**:
For the above equation to hold true, the logarithm must be zero:
\[ \log \left( \frac{[\text{Products}]}{[\text{Reactants}]} \right) = 0 \]

7. **Solve for the Concentration Ratio**:
The logarithm of 1 is zero, therefore:
\[ \frac{[\text{Products}]}{[\text{Reactants}]} = 1 \]

8. **Conclusion**:
This means that the concentration of products is equal to the concentration of reactants:
\[ [\text{Products}] = [\text{Reactants}] \]

Thus, the ratio of the concentrations of reactants to products is:
\[ \frac{[\text{Reactants}]}{[\text{Products}]} = 1 \]

### Final Answer:
The electrode potential becomes equal to the standard electrode potential when the concentration ratio of reactants to products is **1**.