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A 50.00 mL aliquot of a hard water sample is titrated with 15.00 mL of 0.01280...

A 50.00 mL aliquot of a hard water sample is titrated with 15.00 mL of 0.01280 M EDTA. A second 50.00 mL aliquot portion is made sufficiently alkaline with NaOH to precipitate the Mg ions. The precipitate was filtered and the filtrate was titrated with 10.00 mL of 0.01280 EDTA. Calculate the ppm Mg and Ca in the water sample.

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