the calcium in a 300.0-mL sample of natural water was determined by precipitating the cation as CaC204. The precipitate was filtered, washed, and ignited in a crucible with an empty mass of 26.80 g. The mass of the crucible plus CaO (56 g/mol) was 26.90 g. Calculate the concentration of Ca in water in units of gram/100 mL of the water.
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