You measure 2.34 g of K2Cr2O7 into a volumetric flask. You dilute the K2Cr2O7 with water to a volume of 250 mL. It takes 35.7 mL of this solution to titrate 17.8 mL of a solution of Na2C2O4 in the presence of excess acid. What was the concentration of the original Na2C2O4 solution? (The net ionic equation of the redox reaction is shown below.)
Choose one answer.
a. 63.8 M
b. 56.3 M
c. 0.192 M
d. 0.0638 M
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