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

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Acid Dissociation Constant
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How do weak acids dissociate in aqueous solution?

Only slightly

What do weak acids release when dissolved in water?

Relatively few H+\text{H}^+ ions

What does KaK_a provide for a weak acid?

A quantitative measure of strength

What does a higher KaK_a value indicate?

A stronger weak acid

What does a lower KaK_a value indicate?

A weaker acid with less dissociation

What is the expression for KaK_a for the acid HA\text{HA}?

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

In the KaK_a expression, what does [H+][\text{H}^+] represent?

Concentration of hydrogen ions

In the KaK_a expression, what does [A−][\text{A}^-] represent?

Concentration of the conjugate base

In the KaK_a expression, what does [HA][\text{HA}] represent?

Concentration of undissociated acid

Why is KaK_a typically expressed in standard form?

Values are often very small

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