Buffers (AQA A-Level Chemistry): Quizzes

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What is the main function of a buffer solution?

Resist pH changes when acid/base added

What two components make up an acidic buffer?

A weak acid and its salt

What pH range do acidic buffers maintain?

Below 7

Which pair forms a basic buffer?

Ammonia and ammonium chloride

When acid is added to a buffer, what reacts with the H+\text{H}^+ ions?

The conjugate base A−\text{A}^-

What happens when base is added to an acidic buffer?

Weak acid dissociates to restore H+\text{H}^+

What pH does blood maintain using buffer systems?

Around 7.4

In the Henderson-Hasselbalch equation, what does [A−][\text{A}^-] represent?

Concentration of conjugate base

What formula calculates [H+][\text{H}^+] in a buffer solution?

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

How do you convert pKa\text{p}K_a to KaK_a?

Ka=10−pKaK_a = 10^{-\text{p}K_a}

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Equilibrium constant (Kp) for Homogeneous Systems (A Level only)

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Thermodynamics (A Level only)

Rate Equations (A Level only)

Equilibrium constant (Kp) for Homogeneous Systems (A Level only)

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