Chemistry
Chemistry
Problem
2, 4-dinitrophenol ( ) acts as buffer and if pH of this buffer is adjusted to 5, the ratio of concentration of dissociated and undissociated molecules of 2, 4-dinitrophenol is : a. 1 b. 10 c. 0.1 d. 0.01Intuitive explanation
The key here is the Henderson-Hasselbalch equation, which relates pH, , and the ratio of dissociated to undissociated forms of a weak acid. When pH differs from , this ratio tells you which form dominates—and by how much. Since your pH is one unit above the , the dissociated form will outnumber the undissociated form by a predictable factor that depends only on that difference.
Intuitive explanation
The key here is the Henderson-Hasselbalch equation, which relates pH, , and the ratio of dissociated to undissociated forms of a weak acid. When pH differs from , this ratio tells you which form dominates—and by how much. Since your pH is one unit above the , the dissociated form will outnumber the undissociated form by a predictable factor that depends only on that difference.