What is another name for the acid dissociation constant?
a. ionization constant
b. equilibrium constant
c. rate constant
d. mole fraction

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-

Since this process results in the formation of ions, Ka is also referred to as the ionisation constant.