The chemical equation Fe + 2HCl -> FeCl2 + H2

  1. Detailed information about the equation Fe + 2HCl -> FeCl2 + H2:
    The above equation describes the chemical reaction between iron (Fe) and hydrochloric acid (HCl) to form iron(II) chloride (FeCl2) and hydrogen (H2). In the reaction, each molecule of iron (Fe) corresponds to 2 molecules of HCl, forming 1 molecule of FeCl2 and 1 molecule of H2.

  2. Reaction conditions:
    This reaction typically occurs at room temperature and standard pressure. Iron (Fe) needs to be in small granules or powder form to increase the contact area between iron and acid, thus promoting a rapid reaction.

  3. Reaction process:
    When iron (Fe) comes into contact with hydrochloric acid (HCl), iron will replace hydrogen in the acid molecule to form iron(II) chloride (FeCl2) and hydrogen (H2). The reaction occurs as follows:
    Fe + 2HCl -> FeCl2 + H2

  4. Phenomena occurring:
    When the reaction occurs, iron will gradually dissolve in the hydrochloric acid solution, becoming transparent and turning to the faint yellow color of FeCl2. Simultaneously, bubbles of hydrogen gas will appear, which are clearly visible when the container is sealed or when the hydrogen gas is passed through lime water, emitting colorless and odorless gas bubbles.

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