The calcium in a 200.0 mL sample of a natural water was determined by precip itating the cation as CaCzoa. The precipitate was filtered, washed, and...

The calcium in a 200.0 mL sample of a natural water was determined by precip itating the cation as CaCzoa. The precipitate was filtered, washed, and ignited in a crucible with an empty mass of 26.6002 g. The mass of the crucible plus Cao (56077 g/mol) was 26.7134 g. Calculate the cuncentration of Ca (40.078 g/mol) in water in units per 100 ml of the water