The total concentration of Ca 2+ and Mg2+ in a sample of

Chapter , Problem 23.96

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The total concentration of Ca 2+ 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+ + 3EDTA4 4- 3Mg(EDTA)4 2- Ca 2+ + 3EDTA4 4- 3Ca(EDTA)4 2- It requires 31.5 mL of 0.0104 M 3EDTA4 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 3EDTA4 4-. Calculate the concentrations of Mg2+ and Ca 2+ in the hard water in mg>L.

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