The pH of an aqueous solution of a salt is 10. The salt

Options

A. NaCI
B. `NH_(4)CI`
C. `CH_(3)COONa`
D. `(NH_(4))_(2)SO_(4) `

Answer

To determine which salt corresponds to a pH of 10 in an aqueous solution, we can follow these steps:

### Step-by-Step Solution:

1. **Understand pH and its implications**:
- The pH of a solution is a measure of its acidity or basicity. A pH of 7 is neutral, below 7 is acidic, and above 7 is basic. A pH of 10 indicates a basic solution.

2. **Identify the nature of the salt**:
- Since the solution is basic (pH = 10), the salt must be derived from a weak acid and a strong base. This is because a salt formed from a strong acid and a strong base would result in a neutral solution (pH = 7).

3. **Analyze the given options**:
- The options provided are:
- NaCl (sodium chloride) - derived from strong acid (HCl) and strong base (NaOH).
- NH4Cl (ammonium chloride) - derived from weak base (NH3) and strong acid (HCl).
- CH3COONa (sodium acetate) - derived from weak acid (acetic acid) and strong base (NaOH).
- (NH4)2SO4 (ammonium sulfate) - derived from weak base (NH3) and strong acid (H2SO4).

4. **Determine the correct salt**:
- Among the options, only CH3COONa (sodium acetate) is derived from a weak acid (acetic acid) and a strong base (NaOH). This combination would produce a basic solution, which aligns with the given pH of 10.

5. **Conclusion**:
- Therefore, the salt that corresponds to a pH of 10 in an aqueous solution is **CH3COONa (sodium acetate)**.