The formulae for these reactions are: MnO2 + 2FeSO4 + 3H2SO4 → MnSO4 + Fe2(SO4)3 + 2H2O, (1) Fe + Fe2(SO4)3 → 3FeSO4, (2) Fe + H2SO4 → FeSO4 + H2, (3) Zn + H2SO4 → ZnSO4 + H2. (4) When the dry battery is dissolved in steel acid cleaning waste solution, ...
the Fe3O4-35nm sample, two solutions were prepared: a basic solution consisting on a mixture of 25 mL NaNO3 (2 M) and NaOH (4.2 M), 88 mL of distilled water and 62.5 mL of ethanol, and an acid solution formed by 13.9 g of FeSO4·7H2O dissolved in 50 mL of H2SO4 (0.01 M)...