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The pH of a calcium containing solution is adjusted by the additionof a few drops 0f 2M KOH and titrated with 0.01000M EDTA. If a10.00 ml aliquot of the Ca²⁺ containing solution requires 15.40 ml of the EDTA to reach the equivalence point. What is the concentration of Ca²⁺ with in the unknown sample?

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