A sample of low-fat milk which is having 2.50 mL, was treated with sodium oxalate, and the precipitate was filtered and dissolved in H2SO4. This solution required 6.20 mL of4.56 x 10-3 M KMnO4 to reach the end point.
1. Determine the molarity of Ca2+ in the milk.
2. Calculate the concentration of Ca2+ in g/L?