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The calcium in a 200 mL sample of a natural water was determined by precipitating the cation as CaC2O4. The precipitate was filtered, washed and...

The calcium in a 200 mL sample of a natural water was determined by precipitating the cationas CaC2O4. The precipitate was filtered, washed and ignited in a crucible with an empty massof 26.6002 g. The mass of the crucible plus CaO (M.W 56.077 g/mol) was 26.7134 g. Calculatethe concentration of Ca (MW 40.078 g/mol) in the water in units of gram per 100 mL.

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