4 A portion of steel 0.325 g was dissolved in acid and after oxidation of chromium with ammonium persulfate, 25.00 ml of a colored solution was obtained; 10.00 ml of this solution was diluted with water to 50.00 ml. A standard solution was prepared by dissolving 0.125 g of K2Cr2O7 in 250.0 ml of water. To equalize the colors of the test solution and 25.00 ml of distilled water, 12.50 ml of the standard solution was added to the water and diluted with water to 50 ml. Determine the chromium content in steel (in %).

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