Diprotic base

Definition

A diprotic base is a base that can accept two protons (H\(^+\)) per molecule. It typically undergoes two stages of protonation, each with its own equilibrium constant.

5 Must Know Facts For Your Next Test

1. Diprotic bases have two distinct $K_b$ values, corresponding to each stage of protonation.
2. The first $K_b$ value is always larger than the second $K_b$ value due to the decreasing availability of protons.
3. Examples of diprotic bases include carbonate ion (CO$_3^{2-}$) and oxalate ion (C$_2$O$_4^{2-}$).
4. In titrations involving diprotic bases, there are two equivalence points corresponding to each protonation step.
5. The Henderson-Hasselbalch equation can be used for buffer calculations involving diprotic bases.

Related terms

Monoprotic Acid: An acid that donates only one proton (H\(^+\)) per molecule during the reaction.

Polyprotic Acid: An acid that can donate more than one proton (H\(^+\)) per molecule. These acids undergo multiple dissociation steps.

$K_b$ (Base Dissociation Constant): $K_b$ is the equilibrium constant for the dissociation of a base into its conjugate acid and hydroxide ion ($OH^-$) in water.