Complex ions

Q1. Give the equation for the complete reaction of sodium hydroxide solution with a solution of hexaaquairon (II) ions.

Q2. What is the electronic configuration for the complex ion [Cr(H2O)6]3+. Distinguish clearly the chromium electrons from those of the ligand.

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  • 1 十年 前
    最佳解答

    Q1.

    4OH- + [Fe(H2O)6]2+ --> [Fe(OH)4(H2O)2]2- + 4H2O

    lone pair of OH- is more concentrated and coordinates Fe2+ with more energetically stability with high charge density central ion Fe2+. therefore, the stability contant when first few OH- ligands are attached to Fe2+.

    when more OH- replace H2O, the overall charge of the complex attains a negative charge which electrostatically repel further replacement of OH-.

    Q2.

    [Cr(H2O)6]3+ is hexa-coordinated and is geometrically octahedral.

    this can be deduced that Cr3+ is d2sp3 hybridised.

    let x be arrow pointing down and y pointing up for the sake of representation of electrons of Cr3+

    and X and Y be those belong to water ligands pointing up and down respectively.

    underline, _, means half filled.

    before hybridisation: 3d: |x_|x_|x_| | | 4s:| | 4p:| | | |

    hybridisation requires low lying vacant 4p orbitals

    after hybridisation: 3d: |x_|x_|x_| d2sp3: |X Y|X Y|X Y|X Y|X Y|X Y|

    資料來源: myself
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