Chemistry · A-Level · AQA · AQA A-level Chemistry - (7405) · Specification point · 3.1.12.4 · Physical chemistry · Acids and bases (A-level only)
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3.1.12.4 Weak acids and bases Ka for weak acids (A-level only)
| Content | Opportunities for skills development |
|---|---|
Weak acids and weak bases dissociate only slightly in aqueous solution. Kₐ is the dissociation constant for a weak acid. |
Students should be able to:
construct an expression for Kₐ
perform calculations relating the pH of a weak acid to the concentration of the acid and the dissociation constant, Kₐ
convert Kₐ into pKₐ and vice versa.
MS 0.0 Students carry out pKₐ calculations and give appropriate units. MS 0.1 Students understand standard form when applied to areas such as (but not limited to) Kₐ AT a, c, d, e, f and k PS 2.3 Students could calculate Kₐ of a weak acid by measuring the pH at half neutralisation. |