The amount of calcium present in milk can be determined

Last updated: 8/6/2022

The amount of calcium present in milk can be determined through gravimetric analysis by adding oxalate to a sample and measuring the mass of calcium oxalate precipitated. What is the mass percent of calcium in milk if 0.429 g of calcium oxalate, CaC204, forms in a 125-g sample of milk when excess aqueous sodium oxalate is added? Na2C₂O4 (aq) + Ca2+ (aq) → CaC204 (s) + 2 Na+ (aq) 0.107% 0.202% 0.343% 1.10% 1.37%