500 mL of 0.1 N `CH_(3)COOH`+500 mL of 0.1 N `NaOH`
Text Solution
AI Generated Solution
The correct Answer is:
To determine which of the given options is a buffer solution, we need to understand the definition and characteristics of a buffer solution. A buffer solution is one that resists changes in pH upon the addition of small amounts of acid or base. Typically, a buffer solution consists of a weak acid and its conjugate base or a weak base and its conjugate acid.
### Step-by-Step Solution:
1. **Identify the Components of a Buffer Solution**:
- A buffer solution is typically made from a weak acid and its salt (conjugate base) or a weak base and its salt (conjugate acid).
- For example, acetic acid (CH₃COOH) and sodium acetate (CH₃COONa) form a buffer solution.
2. **Analyze Each Option**:
- We need to evaluate the provided options to see if they meet the criteria for a buffer solution.
3. **Option 1: 500 ml of 0.1 N CH₃COOH and 500 ml of 0.1 N Ca(OH)₂**:
- Here, we have a weak acid (CH₃COOH) and a strong base (Ca(OH)₂).
- The reaction will neutralize the acid, but there is no conjugate base present. Therefore, this does not form a buffer solution.
4. **Option 2: 500 ml of 0.1 N CH₃COOH and 500 ml of 0.1 N HCl**:
- This option consists of a weak acid (CH₃COOH) and a strong acid (HCl).
- There is no weak base or conjugate base present, so this cannot form a buffer solution.
5. **Option 3: 500 ml of 0.1 N CH₃COOH and 500 ml of 0.2 N NaOH**:
- In this case, we have a weak acid (CH₃COOH) and a strong base (NaOH).
- The strong base will completely neutralize the weak acid, but there will be no conjugate base formed in sufficient quantity to create a buffer. Thus, this does not form a buffer solution.
6. **Option 4: 500 ml of 0.1 N CH₃COOH and 500 ml of 0.1 N NaOH**:
- Here, we have a weak acid (CH₃COOH) and a strong base (NaOH).
- The reaction will produce the conjugate base (sodium acetate, CH₃COONa) and water. This results in a mixture of the weak acid and its conjugate base, which qualifies as a buffer solution.
### Conclusion:
The correct answer is **Option 4: 500 ml of 0.1 N CH₃COOH and 500 ml of 0.1 N NaOH**, as it forms a buffer solution.
