| [Visitor (113.218.*.*)]answers [Chinese ] | Time :2024-03-12 | Iron and nitrate
When dilute nitric acid is insufficient, the chemical equation for the reaction of iron and dilute nitric acid is: 3Fe 8HNO3=3Fe(NO3)2 2 NO↑ 4H2O. When the dilute nitric acid is sufficient, the reaction equation is: Fe 4HNO3=Fe(NO3)3 NO↑ 2H2O. Iron is a relatively active metal that precedes hydrogen in the sequence of metal activity. It is chemically active and is a good reducing agent. Iron cannot be burned in air, but it can burn violently in oxygen.
The molecular formula of nitric acid is HNO3, which is a strong oxidizing and corrosive inorganic acid, and the anhydride is nitrous pentoxide. Nitric acid is less acidic than sulfuric acid and hydrochloric acid (PKa=-1.3), soluble in water, completely ionized in water, its dilute solution is colorless and transparent at room temperature, and the concentrated solution is brown. In general, iron reacts with dilute sulfuric acid to form ferrous sulfate, and bubbles are generated. In practice, it's more complicated. However, the concentrated sulfuric acid or concentrated nitric acid that iron is cold will be passivated to form a dense oxide film (the main component Fe3O4), so concentrated sulfuric acid and concentrated nitric acid can be shipped with iron. |
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