17 28 An Edta Solution Was Prepared By Dissolving Apporis Imately 4 G Of The Disodium Sals In Approximately 1 Of Water 1 (21.95 KiB) Viewed 40 times
17-28. An EDTA solution was prepared by dissolving apporis imately 4 g of the disodium sals in approximately 1 of water. An average of 42.35 mL of this solution in required to titrate 50.00−mL aliquots of a standerc
that contained 0.7682 g of MgCO3 per liter. Titration of a 25.00-mL sample of mineral water at pH10 required 18.81 mL of the EDTA solution. A 50.00−mL aliquot of the mineral water was rendered strongly alkaline to precipitate the magnesium at Mg(OH)2. Titration with a calcium-specific indicator required 31.54 mL of the EDTA solution. Calculate (a) the molar concentration of the EDTA solution. (b) the concentration of CaCO3 in the mineral water in ppm. (c) the concentration of MgCO3 in the mineral water in ppm.
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