4. Determine the mass fraction of nickel in steel if, after dissolving 1.5 g of sample, nickel was precipitated with dimethylglyoxime and the precipitate was dissolved in HCl. The volume of the solution was brought to 50.0 ml and 20.0 ml was titrated with 9.4 ml of EDTA solution with a concentration of 0.100 mol/l.
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