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A water scientist determined the concentrations of calcium and magnesium ions in a sample by titration with 0.06500 M EDTA. Two 50.00-mL portions were taken. The first titration was carried out at pH 10.00 and required 19.54 mL of titrant to reach the end point. The second 50.00-mL sample was adjusted to pH 12.00 with KOH to precipitate the magnesium ions as Mg(OH)2. The supernatant required 12.82 mL of titrant to reach the end point. What are the concentrations of calcium and magnesium ions in the original water sample?

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