What is CrCl2? Important knowledge about CrCl2.

  1. Definition of CrCl2
    1.1 Name: CrCl2 is also known as Dicromyl chloride or Chromium(II) chloride.
    1.2 English name: Chromium(II) chloride.
    1.3 Atomic mass of CrCl2 is 122.9 g/mol.
    1.4 Molecular structure: This molecule consists of one Chromium (Cr) atom and two Chlorine (Cl) atoms.
    1.5 Ionic structure: In CrCl2, Chromium has an oxidation state of +2 and forms Cr2+ ion, Chlorine forms Cl- ion.

  2. Properties of CrCl2
    2.1 Physical properties:

    • State: Solid at room temperature.
    • Color: Blue to green.
    • Odor: Odorless.
    • pH level: CrCl2 has a weakly acidic nature.
      2.2 Chemical properties: CrCl2 reacts with water to form Cr(OH)2 and HCl. It can also react with metals like Zn.

  3. Common chemical reactions:
    CrCl2 + 2NaOH -> Cr(OH)2 + 2NaCl(reactionwithalkali)
    CrCl2 + Zn -> ZnCl2 + Cr(reactionwithmetal)

  4. Preparation of CrCl2
    4.1 Laboratory preparation: Heat CrO3 with HCl to form CrCl2 and Cl2.
    4.2 Industrial preparation: CrCl2 is usually produced by reducing CrCl3 with hydrogen at high temperature.

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