Which of the following is true about the pH of a solution of sulfuric acid?
A)If the solution is dilute the pH can not be calculated.
B)If the solution is dilute the pH is completely controlled by the first dissociation.
C)If the solution is dilute the pH is completely controlled by the second dissociation.
D)If the solution is concentrated the pH is partially controlled by the second dissociation.
E)If the solution is dilute the pH is partially controlled by the second dissociation.

Question

Quizplus · Accepted Answer

Sulfuric acid is a strong diprotic acid, which means it can donate two hydrogen ions. In a dilute solution, the first dissociation dominates and produces a high concentration of H+ ions, leading to a low pH. The second dissociation is less significant in a dilute solution and contributes less to the overall pH. Therefore, the pH of a dilute solution of sulfuric acid is partially controlled by the second dissociation. In a concentrated solution, both dissociations contribute significantly to the pH, and the second dissociation partially controls the acidity of the solution. Option A is not correct because the pH of a dilute solution can be measured experimentally or can be calculated from the dissociation constant. Option B is incorrect because the second dissociation also affects the pH of the solution. Option C is incorrect because the first dissociation is the stronger one and contributes more to the pH. Option D is incorrect because the second dissociation partially controls the pH even in a dilute solution.

Which of the Following Is True About the PH of a Solution