Solved: The total concentration of Ca2+ and Mg2+ in a

Chapter , Problem 96IE

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Problem 96 IE

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)]2-

It 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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