Classify each acid as strong or weak. If the acid is weak, write an expression for the acid ionization constant (K_a). c. H₂SO₄

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Identify the acid in question: \( \text{H}_2\text{SO}_4 \) (sulfuric acid).

Recall that \( \text{H}_2\text{SO}_4 \) is a strong acid, meaning it completely dissociates in water.

Understand that strong acids do not have an acid ionization constant (\( K_a \)) because they fully dissociate.

Note that the first dissociation of \( \text{H}_2\text{SO}_4 \) is complete: \( \text{H}_2\text{SO}_4 \rightarrow \text{H}^+ + \text{HSO}_4^- \).

Recognize that the second dissociation of \( \text{HSO}_4^- \) is weak: \( \text{HSO}_4^- \rightleftharpoons \text{H}^+ + \text{SO}_4^{2-} \), and for this, you can write \( K_a = \frac{[\text{H}^+][\text{SO}_4^{2-}]}{[\text{HSO}_4^-]} \).

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Strong and Weak Acids

Strong acids completely dissociate in water, releasing all their hydrogen ions (H+), while weak acids only partially dissociate. This distinction is crucial for understanding acid behavior in solution, as strong acids have a high concentration of H+ ions, leading to a lower pH, whereas weak acids result in a higher pH due to their incomplete dissociation.

Acid Ionization Constant (Ka)

The acid ionization constant (Ka) quantifies the strength of a weak acid by measuring the extent of its dissociation in water. It is defined by the equilibrium expression: Ka = [H+][A-]/[HA], where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the undissociated acid. A larger Ka value indicates a stronger weak acid.

H2SO4 as a Strong Acid

H2SO4, sulfuric acid, is classified as a strong acid because it completely dissociates in its first ionization step, producing H+ and HSO4-. Although HSO4- can act as a weak acid in its second ionization, the first dissociation is what primarily characterizes H2SO4 as a strong acid, making it essential to recognize its behavior in acid-base reactions.

Classify each acid as strong or weak. If the acid is weak, write an expression for the acid ionization constant (Ka). c. H2SO4