15. Solving a chemistry problem

15. Solving a chemistry problem

7. From a sample of 1.2 g of a sample, potassium chromate, a solution was prepared in a volumetric flask with a capacity of 100 ml. To 25 ml of the resulting ra-a, an excess of ra-a lead nitrate is added. The resulting precipitate was filtered, washed, put into solution and treated with 10 ml of 0.1 M EDTA solution, the excess of which was titrated with 8 ml of 0.05105 M ZnSO4 solution. Calculate the content of chromate ions in the sample. Answer 23.27%

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