Oxaloacetic acid (C4H5O5, pKa1 = 2.56, pKa2 = 4.37), a diprotic acid, is part of the citric acid cycle.  What is the concentration of oxaloacetic acid (C4H5O5) in a 0.5000 M solution of sodium oxaloacetate (Na2C4H3O5)?

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