Give a conclusion on the quality of the riboflavin solution 0.02% -100 ml in terms of quantitative content according to order No. 305, if, during the photometric determination, a sample of 0.5 ml was diluted with water to 10 ml and an optical density Dx = 0.250 was obtained. The optical density of the standard solution prepared by the same method Dst=0.255.

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