113. Задачка по химии №011 343

Types of reactions used in photometry to obtain colored compounds and requirements for them.
The content of phosphorus in the analyzed object lies in the range of 1.0-0.5%. What weight of it should be taken for analysis, if the final volume of the sample solution is 100 ml, 25 ml was taken for analysis for phosphorus, a photometric reaction was carried out and the volume of the solution was brought to 50 ml, and the reference series in the same volumes contains from 2 to 10 mg of phosphorus ?

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