56. Solving a chemistry problem

103. During polarography of a standard solution containing 2.0 x 10–3 mol/l Pb(II) and 510 x 10–3 mol/l Tl(I) against the background of sodium hydroxide, the wave heights were 22 and 18 mm, respectively. Calculate the mass fractions of the indicated elements in a sample of contaminated salt, if after dissolving a sample of salt weighing 4.7834 g, 50 ml of solution was obtained, and during polarography under the same conditions, the wave height of the metals being determined was 37 mm and 10 mm.