The Ca in a 200.0-mL sample of natural water was determined by precipitating the cation as CaC,O4 after the addition of oxalic acid (H2C204). C,0,2 (ag) + Ca²* (aq) → CaC,O4(s) The precipitate was filtered, washed & ignited in a crucible w/ an empty mass of 26.6002 g. CaC,O4(s) → CaO(s) + CO(g + CO2(g) (), The mass of the crucible plus CaO was 26.7134 g. Calculate the concentration of Ca (molarity) in the water sample.

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