21(a). When determining titanium by the addition method, a sample of steel a was dissolved, the volume was adjusted to 50 ml. Then 20.0 ml aliquots of the solution were withdrawn into two 50 ml volumetric flasks. In one of them, a weighed portion of titanium salt containing 0.0010 g of titanium was added. Hydrogen peroxide was added to both flasks and the volumes were adjusted to the mark. Calculate the percentage of titanium in steel if the following results were obtained from the photometry of solutions:

Options a b c d
a, d 0.5000 0.4828 0.4600 0.6150
Dx 0.22 0.19 0.20 0.25
Dх st 0.44 0.39 0.42 0.45

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