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QUESTION
What is the formula for the conjugate of H2C2O4?
The conjugate base of oxalic acid is ##HO(O=)C-C(=O)O^-##
The conjugate base of any acid, ##HA##, is the original acid LESS a proton, ##H^+##. As for any chemical reaction, mass and charge are conserved. Therefore the conjugate base of ##HA## is ##A^-##.
Here we start with a (potential) diacid, ##HO(O=)C-C(=O)OH##, oxalic acid. So we remove a proton, and get ##HO(O=)C-C(=O)O^-##. The conjugate base of this species is ##""^(-)O(O=)C-C(=O)O^-##, oxalate anion.
