The total concentration of Ca2+ and Mg2+ in a sample of hard water was determined by
Chapter 24, Problem 24.77(choose chapter or problem)
The total concentration of Ca2+ and Mg2+ in a sample of hard water was determined by titrating a 0.100-L sample of the water with a solution of EDTA4-. The EDTA4- chelates the two cations: Mg2+ + [EDTA]4- - ---> [Mg(EDTA)]2- Ca2+ + [EDTA]4- - ---> [Ca(EDTA)fIt requires 31.5 mL of 0.0104 M [EDTA]4- solution to reach the end point in the titration. A second 0.100-L sample was then treated with sulfate ion to precipitate Ca2+ as calcium sulfate. The Mg2+ was then titrated with 18.7 mL of 0.0104 M [EDTA]4 -. Calculate the concentrations of Mg2+ and Ca2+ in the hard water in mg/L.
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