H2C2O4(aq) + HPO4^2- --> HC2O4^- + H2PO4-
<span>The conjugate base of a weak acid is the anion which remains when H+ is removed. </span>
<span>H2C2O4 <==> H+ + HC2O4^- </span>
<span>acid ............. .......... conjugate base </span>
<span>H2PO4^- <==> H+ + HPO4^2- </span>
<span>acid ............. .......... conjugate base</span>
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