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Ch.16 - Acids and Bases
Tro - Chemistry: A Molecular Approach 4th Edition
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Tutti i libri di testoTro 4th EditionCh.16 - Acids and BasesProblema 42c
Capitolo 16, Problema 42c

Classify each acid as strong or weak. If the acid is weak, write an expression for the acid ionization constant (Ka). 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.
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02:19
Weak Acid-Strong Base Titration Curve

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.
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Characteristics of Ka and Kb

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.
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Strong Acid-Strong Base Titration
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