For two acids A and B, `pK_(a) = 1.2 , pK_(b) = 2.8` respectively in value , then which is true

Options

A. A and B both are equally acidic
B. A is stronger than B
C. B is stronger than A
D. Neither A nor B is strong

Answer

To determine which acid is stronger between acids A and B based on their pKa values, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding pKa and Ka**:
- pKa is the negative logarithm of the acid dissociation constant (Ka).
- The relationship is given by the formula:
\[ pKa = -\log(Ka) \]
- A lower pKa value indicates a stronger acid because it corresponds to a higher Ka value.

2. **Given Values**:
- For acid A, \( pK_a = 1.2 \)
- For acid B, \( pK_b = 2.8 \)

3. **Comparing pKa Values**:
- Acid A has a pKa of 1.2, which is lower than the pKa of acid B (2.8).
- Since lower pKa values indicate stronger acids, we can conclude that acid A is stronger than acid B.

4. **Conclusion**:
- Therefore, the correct statement is that acid A is stronger than acid B.

### Final Answer:
Acid A is stronger than acid B.

---