56. Solving a chemistry problem

56. Solving a chemistry problem

1. To determine the content of ethmozine and ethacizine in the tablets of the preparation of metacysin by HPLC, 0.06 g of the powder of crushed tablets is placed in a 25 ml volumetric flask, 20 ml of a 0.02 mol / l solution of potassium dihydrogen phosphate is added, the mixture is thoroughly mixed, the volume of the solution is adjusted to flask with the same solvent up to the mark, mix and filter. 2 ml of the filtrate is taken, transferred to a 25 ml volumetric flask, the volume of the solution is adjusted to the mark of 0.02 mol/l with a solution of potassium dihydrogen phosphate, stirred and the test solution is obtained, which is subjected to chromatography on an HPLC chromatograph.
Under the same conditions, a standard solution containing ethmosine and etacizine with a concentration of 0.000096 g/ml and 0.000017 g/ml, respectively, is chromatographed. Calculate the content of etmosin or ethacizin in one tablet in grams. The areas of the corresponding peaks in the chromatogram of the test and standard samples are related as S : Sst = 0.99.

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