Which of the following, when mixed, will give a solution with `pHgt7` ?

Options

A. 100 mL 0.1 MHCI+ 100 mL 0.1 MKCI
B. `100mL 0.1MH_(2)SO_(4)+100mL0.1MNaOH`
C. `100mL 0.1MCH_(3)COOH+100mL0.1MKOH`
D. `50mL 0.1 M HCl +50 mL 0.1 M CH_(3)COONa`

Explanation

To determine which of the given mixtures will yield a solution with a pH greater than 7, we need to analyze the options provided. The pH of a solution is influenced by the nature of the solutes involved, specifically whether they are acids or bases.

### Step-by-Step Solution:

1. **Identify the Components**:
- The question involves mixing different solutions. We need to identify whether each component is an acid or a base.

2. **Evaluate Each Option**:
- **Option A**: 100 ml of 0.1 M HCl + 100 ml of 0.1 M KCl
- HCl is a strong acid, and KCl is a neutral salt. Mixing these will result in a solution with a pH less than 7 because the strong acid dominates.

- **Option B**: 100 ml of 0.1 M H2SO4 + 100 ml of 0.1 M NaOH
- H2SO4 is a strong acid and NaOH is a strong base. When mixed, they will neutralize each other. However, since H2SO4 has a higher concentration of H⁺ ions (0.2 M) compared to the 0.1 M concentration of NaOH, the resulting solution will still be acidic (pH < 7).

- **Option C**: 100 ml of 0.1 M CH3COOH + 100 ml of 0.1 M NaOH
- CH3COOH (acetic acid) is a weak acid, and NaOH is a strong base. The reaction between them will produce a salt (sodium acetate) and water. The resulting solution will be basic due to the presence of the salt from a weak acid and a strong base, leading to a pH greater than 7.

- **Option D**: 100 ml of 0.1 M HCl + 100 ml of 0.1 M CH3COONa
- HCl is a strong acid, and CH3COONa is a salt derived from a weak acid (acetic acid) and a strong base (NaOH). The presence of the strong acid will dominate, resulting in a solution with a pH less than 7.

3. **Conclusion**:
- The only mixture that results in a solution with a pH greater than 7 is **Option C**: 100 ml of 0.1 M CH3COOH + 100 ml of 0.1 M NaOH.

### Final Answer:
**Option C**: 100 ml of 0.1 M CH3COOH + 100 ml of 0.1 M NaOH will give a solution with pH > 7.