An EDTA solution was prepared by dissolving approximately 4 g of the disodium salt in approximately 1 L of water. An average of 41.87 mL of this solution was required to titrate 50.00-mL aliquots of a standard that contained 0.6987 g of MgCO₃ (84.31 g/mol) per liter. Titration of a 25.00-mL sample of mineral water at pH 10 required 19.32 mL of the EDTA solution. A 50.00-mL aliquot of the mineral water was rendered strongly alkaline to precipitate the magnesium. Titration with a calcium-specific indicator required 30.27 mL of the EDTA solution. a) Calculate the molar concentration of the EDTA solution. b) Calculate concentration of CaCO₃ (100.09 g/mol) of the mineral water in ppm. c) Calculate concentration of MgCO₃ (84.31 g/mol) of the mineral water in ppm
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An EDTA solution was prepared by dissolving approximately 4 g of the disodium salt in approximately 1 L of water. An average of 41.87 mL of this solution was required to titrate 50.00-mL aliquots of a standard that contained 0.6987 g of MgCO₃ (84.31 g/mol) per liter. Titration of a 25.00-mL sample of mineral water at pH 10 required 19.32 mL of the EDTA solution. A 50.00-mL aliquot of the mineral water was rendered strongly alkaline to precipitate the magnesium. Titration with a calcium-specific indicator required 30.27 mL of the EDTA solution.
a) Calculate the molar concentration of the EDTA solution.
b) Calculate concentration of CaCO₃ (100.09 g/mol) of the mineral water in ppm.
c) Calculate concentration of MgCO₃ (84.31 g/mol) of the mineral water in ppm.
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