Question

The organic matter in a 0.9578 g sample of ointment was eliminated by ashing, following which the solid residue of ZnO was dissolved in acid. Treatment with (NH4)2C2O4 resulted in the formation of the sparingly soluble ZnC2O4. The solid was filtered, washed and then redissolved in dilute acid. The liberated H2C2O4 required 38.21 mL of 0.01678 M KMnO4. Calculate the % ZnO in the medication.

Answer 1