13. An ion exchange has been established between the soil solution and the mineral skeleton of the soil according to the scheme
3xSiO42- ∙2xA13+ + 3xFeCl2 ↔ 3xSiO42- ∙3xFe2+ + 2xA1C13.
Calculate the concentration of A13+ ions in the solution, (mol/l), if soil water with a density of 1037 kg/m3 contains 4% Fe2+ ions.
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