Further Acids & Bases Calculations (A Level only) (AQA A-Level Chemistry): Flashcards

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Acid Dissociation Constant
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Extent of weak acid dissociation in water

Slightly

What weak acids release when dissolved

Relatively few hydrogen ions (H+\text{H}^+)

Extent of strong acid dissociation

Almost completely

What KaK_a measures

Quantitative measure of weak acid strength

What a higher KaK_a value indicates

Stronger weak acid (more dissociation)

What a lower KaK_a value indicates

Weaker acid (less dissociation)

Expression for KaK_a for acid HA

Ka=[H+][A−][HA]K_a = \frac{[\text{H}^+][\text{A}^-]}{[\text{HA}]}

What [H+][\text{H}^+] represents in KaK_a expression

Concentration of hydrogen ions

What [A−][\text{A}^-] represents in KaK_a expression

Concentration of conjugate base

What [HA][\text{HA}] represents in KaK_a expression

Concentration of undissociated acid

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