1. Titanium in steel was determined by the photometric method of additions. A sample of 0.150 g was dissolved and the volume was brought to 100 ml. To 25 ml of the resulting solution, the reagent and water were added to 50 ml. To the second portion of 25 ml, 5 ml of titanium with a concentration of 0.04 mg/ml, reagent and water were added to 50 ml. Cuvette l = 1 cm. The optical density of the first solution turned out to be 0.33. and the second one is 0.64. What is the percentage of titanium in steel?

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