In which of the following acid-base titration, the pH is greater than 8 at the equivalence point ?

Options

A. Aceitic acid vs ammonia
B. Acetic acid vs sodium hydroxide
C. Hydrochloric acid vs ammonia
D. Hydrochloric acid vs sodium hydroxide

Explanation

To determine in which acid-base titration the pH is greater than 8 at the equivalence point, we will analyze each option step by step.

### Step 1: Analyze the first option - Acetic Acid vs. Ammonia
- **Acetic Acid (CH3COOH)** is a weak acid.
- **Ammonia (NH3)** is a weak base.
- When they react, they form **Ammonium Acetate (CH3COONH4)**, which is a salt of a weak acid and a weak base.
- At the equivalence point, the solution will be neutral, with a pH of approximately 7 because the weak acid and weak base neutralize each other.

**Conclusion for Option 1:** pH = 7 (not greater than 8).

### Step 2: Analyze the second option - Acetic Acid vs. Sodium Hydroxide
- **Acetic Acid (CH3COOH)** is a weak acid.
- **Sodium Hydroxide (NaOH)** is a strong base.
- They react to form **Sodium Acetate (CH3COONa)**, which is a salt of a weak acid and a strong base.
- At the equivalence point, the concentration of OH⁻ ions will be higher than H⁺ ions, resulting in a basic solution. Therefore, the pH will be greater than 7 and can be significantly greater than 8.

**Conclusion for Option 2:** pH > 8 (this is a potential answer).

### Step 3: Analyze the third option - Hydrochloric Acid vs. Ammonia
- **Hydrochloric Acid (HCl)** is a strong acid.
- **Ammonia (NH3)** is a weak base.
- They react to form **Ammonium Chloride (NH4Cl)**, which is a salt of a strong acid and a weak base.
- At the equivalence point, the solution will be acidic because the salt will hydrolyze to produce H⁺ ions, resulting in a pH less than 7.

**Conclusion for Option 3:** pH < 7 (not greater than 8).

### Step 4: Analyze the fourth option - Hydrochloric Acid vs. Sodium Hydroxide
- **Hydrochloric Acid (HCl)** is a strong acid.
- **Sodium Hydroxide (NaOH)** is a strong base.
- They react to form **Sodium Chloride (NaCl)** and water.
- At the equivalence point, the solution will be neutral, with a pH of approximately 7, as both the strong acid and strong base completely neutralize each other.

**Conclusion for Option 4:** pH = 7 (not greater than 8).

### Final Conclusion:
The only titration where the pH is greater than 8 at the equivalence point is **Option 2: Acetic Acid vs. Sodium Hydroxide**.

### Summary of Steps:
1. **Identify the nature of acids and bases** in each option.
2. **Determine the product formed** at the equivalence point.
3. **Evaluate the pH** based on the strength of the acid and base involved.