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A 50.0-mL sample containing Ni2 was treated with 25.0 mL of 0.050 0 M EDTA to complex all the Ni2 and leave excess EDTA in solution. The excess EDTA was then back-titrated, requiring 5.00 mL of 0.050 0 M Zn2. What was the concentration of Ni2 in the original solution?

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