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The standard recipe used in an exercise uses 3.0 mL of 0.25% phenanthroline solution in 100 mL of final solution to generate the red iron-phenanthroline complex which is determined colorimetrically. What is the initial molarity of phenanthroline in the diluted solution? (0.25% means 2.50 g of phenanthroline (molar mass 180) per liter of solution).

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