A sample of powdered milk weighing 1.450 g was mixed with a buffer of pH 11.5. A few drops of Calmagite indicator were added and the solution required 31.62 mL of 1.538 x 10-2 M EDTA to reach the end point color change. Calculate the percentage of calcium in the milk. In the reaction of EDTA and calcium, one mole of EDTA reacts with one mole of calcium.

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