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Weak Acid and Base Equilibria

AP Chemistry· difficulty 3/5

A weak acid has Ka = 1.0×10⁻⁵. Solutions of varying concentration are tested.

[HA]₀ (M) % ionization 1.00 0.32 0.10 1.00 0.010 3.16 0.0010 10.0

Which trend is consistent with these data?

  • A

    Percent ionization increases as [HA]₀ decreases.

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  • B

    Percent ionization is constant.

  • C

    Percent ionization equals 100% always.

  • D

    Percent ionization decreases as [HA]₀ decreases.

Explanation

For a weak acid, % ionization = √(Ka/[HA]₀)·100% (approximation). As [HA]₀ decreases, % ionization rises.

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