Answer:
a. ionization constant
Explanation:
The acid dissociation constant is an indicative of the strength of an acid in solution i.e. extent to which it dissociates thereby releasing H+ ions. It is represented as Ka
For strong acids, Ka = 1 since they completely dissociate into the respective ions. Example is HCl
HCl → H+ + Cl- Ka = 1
For weak acids like acetic acid (CH3COOH) there is an equilibrium between the dissociated and undissociated ions
CH3COOH ↔ H+ + CH3COO-
\(Ka = \frac{[H+][CH3COO-]}{[CH3COOH]}\)
Since this process results in the formation of ions, Ka is also referred to as the ionisation constant.
