<page_title> Acid dissociation constant </page_title> <section_title> Acidity in nonaqueous solutions </section_title> <table> <cell> Proton sponge <col_header> HA ⇌ A− + H+ </col_header> <col_header> BH+ ⇌ B + H+ </col_header> </cell> <cell> 12.1 <col_header> Water </col_header> <col_header> Water </col_header> </cell> </table>
Proton sponge has a pKₐ value of 12.1.