Answer Happy

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.