Calcium oxalate (CaC2O4) is insoluble in water. This property has been used to determine the amount of Ca2+ ions in blood. The calcium oxalate isolated from blood is dissolved in acid and titrated against a standardized KMnO4 solution as described in Problem 19.70. In one test it is found that the calcium oxalate isolated from a 10.0-mL sample of blood requires 24.2 mL of 9.56 × 10−4 M KMnO4 for titration. Calculate the number of milligrams of calcium per milliliter of blood.
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