In SHE, the pH of the acid solution should be

Options

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

Answer

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

### Step-by-Step Solution:

1. **Understanding SHE**: The Standard Hydrogen Electrode (SHE) is a reference electrode used in electrochemistry. It is based on the half-reaction involving hydrogen ions (H⁺) and hydrogen gas (H₂).

2. **Concentration of the Acid**: In SHE, we typically use a 1 molar (1 M) solution of hydrochloric acid (HCl) as the acid.

3. **Calculating pH**: The pH of a solution is calculated using the formula:
\[ \text{pH} = -\log[\text{H}^+] \]
where \([\text{H}^+]\) is the concentration of hydrogen ions in the solution.

4. **Hydrogen Ion Concentration**: For a 1 M HCl solution, the concentration of hydrogen ions \([\text{H}^+]\) is 1 M because HCl is a strong acid and dissociates completely in water:
\[ \text{HCl} \rightarrow \text{H}^+ + \text{Cl}^- \]
Therefore, \([\text{H}^+] = 1 \, \text{M}\).

5. **Applying the pH Formula**: Now, substituting the concentration into the pH formula:
\[ \text{pH} = -\log(1) = 0 \]

6. **Conclusion**: Thus, the pH of the acid solution in the Standard Hydrogen Electrode is 0.

### Final Answer:
The pH of the acid solution in the Standard Hydrogen Electrode (SHE) should be **0**.

---