conc. nirtric acid－貨運百科

標題:

conc. nirtric acid

發問:

conc. nitric acid 同 Iron(II) salts做反應會出左 Iron(III) salts , NO(g) 同水但conc. nirtic acid 唔係應該出 Nirogen dioxide嫁咩?

最佳解答:

Case I: Solid of iron(II) salt is used When solid of iron(II) salt is added to concentrated nitric acid, the iron(II) salt dissolves in the acid to give aqueous iron(II) ions and the concentration of the nitric acid remains unchanged. In the redox reaction, the concentrated nitric acid is reduced to give nitrogen dioxide gas, while the iron(II) ions are oxidized to iron(III) ions. Fe2+(aq) + 2H+(aq) + NO3-(aq) → Fe3+(aq) + H2O(l) + NO2(g) Case II: Aqueous solution of iron(II) salt is used When aqueous solution of iron(II) salt is added to concentrated nitric acid, the water in the iron(II) soluton dilutes the concentrated nitric acid. In the redox reaction, the diluted concentrated nitric acid is reduced to give nitrogen monoxide gas, while the iron(II) ions are oxidized to iron(III) ions. 3Fe2+(aq) + 4H+(aq) + NO3-(aq) → 3Fe3+(aq) + 2H2O(l) + NO(g) =

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