A sample which is having 2.50 mL of low-fat milk was treated with sodium oxalate, and the precipitate was filtered and dissolved in H2SO4.This solution needed 6.20 mL of 4.56 x 10-3 M KMnO4 to reach the end point.
1. Determine the molarity of Ca2+ in the milk.
2. Determine the concentration of Ca2+ in g/L?