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A chemical reaction is a process in which reactants are converted into products.

Protonation is the addition of a proton to an atom, ion, or molecule.

In the expression of the acid dissociation constant, ${\mathbf{H}}^{\mathbf{+}}$will be released.

In the expression of base dissociation constant, data-custom-editor="chemistry" ${\mathbf{OH}}^{\mathbf{-}}$will be released.

The acid dissociation constant expression for benzoic acid is as shown below:

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COOH}鈬�{\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{COO}}^{-}+{\mathrm{H}}^{+}$

It shows the release of a proton.

The base dissociation constant expression for benzoic acid is as shown below:

It shows the release of a hydroxide ion.

${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{COO}}^{-}+{\mathrm{H}}_2\mathrm{O}鈬�{\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COOH}+{\mathrm{OH}}^{-}$

${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_2+{\mathrm{H}}_2\mathrm{O}鈬�{\mathrm{C}}_6{\mathrm{H}}_5\mathrm{N}銆�{\mathrm{H}}_3{銆�}^{+}+{\mathrm{OH}}^{-}$

The acid dissociation constant expression for anilinium ion is as shown below:

${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_3^{+}鈬�{\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_2+{\mathrm{H}}^{+}$

It shows the release of a proton.