Question: A 20.00 mL sample of an unknown H2C2O4 solution requires titration with 19.88 mL of 0.5621 M NaOH to reach the equivalence point. What is

A 20.00 mL sample of an unknown H2C2O4 solution requires titration with 19.88 mL of 0.5621 M NaOH to reach the equivalence point.

What is the concentration of the unknown H2C2O4 solution?

Express your answer using four significant figures.

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