Hydrochloric acid is a strong acid. Acetic acid is a weak acid. Which statement about hydrochloric acid and acetic acid is correct?(1 point)

Responses

A solution of hydrochloric acid at equilibrium will have a greater concentration of solute than a solution of acetic acid at equilibrium.
A solution of hydrochloric acid at equilibrium will have a greater concentration of solute than a solution of acetic acid at equilibrium.

If the initial concentration of each acid is the same, then acetic acid will produce more H3O+ ions than hydrochloric acid.
If the initial concentration of each acid is the same, then acetic acid will produce more H 3 O + ions than hydrochloric acid.

The pH of a solution of hydrochloric acid must be less than the pH of a solution of acetic acid.
The pH of a solution of hydrochloric acid must be less than the pH of a solution of acetic acid.

The dissociation constant for hydrochloric acid is greater than the dissociation constant for acetic acid.

1 answer

The correct statement is:

The dissociation constant for hydrochloric acid is greater than the dissociation constant for acetic acid.

Hydrochloric acid (HCl) is a strong acid that completely dissociates in solution, whereas acetic acid (CH₃COOH) is a weak acid that only partially dissociates. As a result, the dissociation constant (Ka) for hydrochloric acid is effectively infinite, while the Ka for acetic acid is much smaller, reflecting its weak acidic nature.

Let's clarify the incorrect options:

  1. A solution of hydrochloric acid at equilibrium will have a greater concentration of solute than a solution of acetic acid at equilibrium.

    • This statement is not necessarily true, as it depends on the initial concentrations. However, since HCl fully dissociates, it would typically lead to a higher concentration of H⁺ ions compared to acetic acid at the same initial concentration.
  2. If the initial concentration of each acid is the same, then acetic acid will produce more H₃O⁺ ions than hydrochloric acid.

    • This statement is false because hydrochloric acid fully dissociates, contributing more H₃O⁺ ions compared to the weakly dissociated acetic acid.
  3. The pH of a solution of hydrochloric acid must be less than the pH of a solution of acetic acid.

    • This is true under equal initial concentrations but depends on specific concentrations as weak acids like acetic acid can have less H⁺ concentration at certain lower concentrations.

Thus, the most definitive and correct statement regarding the nature of these acids is the comparison of their dissociation constants.

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