Which statements regarding the Henderson-Hasselbalch equation are true?

1) If the pH of the solution is known as is the pKa for the acid, the ratio of conjugate base to acid can be determined.

2) At pH = pK a for an acid, there is an equal amount of conjugate base to acid in solution.

3) At pH >> pK a for an acid, the acid will be mostly ionized.

4) At pH << pK a for an acid, the acid will be mostly ionized

1 Answer

  • As the Henderson-Hasselbalch equation is

    pH = pKa + log[A-]/[H+]

    The true statements are:

    1) If the pH of the solution is known as is the pKa for the acid, the ratio of conjugate base to acid can be determined.

    2) At pH = pK a for an acid, there is an equal amount of conjugate base to acid in solution.

    3) At pH >> pK a for an acid, the acid will be mostly ionized.

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