In SHE, the pH of the acid solution

Options

A. 7
B. 14
C. 0
D. 4

Answer

To solve the question regarding the pH of the acid solution in the Standard Hydrogen Electrode (SHE), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Standard Hydrogen Electrode (SHE)**:
- The SHE is a reference electrode used to measure the electrode potentials of other electrodes. It is defined to have a standard electrode potential of 0 volts.

2. **Identify the Acid Solution**:
- In the SHE setup, the electrode is typically immersed in a 1 molar hydrochloric acid (HCl) solution.

3. **Determine the Concentration of Hydrogen Ions**:
- Hydrochloric acid (HCl) is a strong acid that completely dissociates in solution. Therefore, a 1 molar HCl solution will produce 1 molar hydrogen ions (H⁺).
- The dissociation can be represented as:
\[ \text{HCl} \rightarrow \text{H}^+ + \text{Cl}^- \]
- This means that the concentration of H⁺ ions in the solution is 1 M.

4. **Calculate the pH**:
- The pH of a solution is calculated using the formula:
\[ \text{pH} = -\log[\text{H}^+] \]
- Substituting the concentration of hydrogen ions:
\[ \text{pH} = -\log[1] \]
- Since the logarithm of 1 is 0:
\[ \text{pH} = -0 = 0 \]

5. **Conclusion**:
- Therefore, the pH of the acid solution in the Standard Hydrogen Electrode is 0.

### Final Answer:
The correct answer is **0** (Option C).

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