<page_title> Acid dissociation constant </page_title> <section_title> Thermodynamics </section_title> <table> <cell> H2A = Oxalic acid <col_header> Compound </col_header> </cell> <cell> 1.27 <col_header> pKa </col_header> </cell> </table>
Oxalic acid has pKₐ value of 1.27.