Acid ionisation constant Ka (Ka = [H+][A-]/[HA] for HA ⇌ H+ + A-)
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Ka = [H+][A-]/[HA] for HA ⇌ H+ + A-
What each symbol means
| Symbol | What it stands for |
|---|---|
| K_a | Strength measure of weak acid (larger = stronger) |
| [HA] | Equilibrium concentration of undissociated acid |
When to use this
Dilute aqueous weak acid; activity ≈ concentration; ICE tables common.