A weak base is one that does not completely dissociate into its ions in water.
Base Dissociation Constant (Kb): The equilibrium constant for the reaction of a base with water to form conjugate acid and hydroxide ion.
It measures the basicity or alkalinity of an aqueous solution on a logarithmic scale.
Hydroxide Ion (OH-): The negative ion formed by one oxygen bonded to one hydrogen; it can be found in many bases.