IB Chemistry HL 2.2.3 Coordination Bonds Question Bank

Practise IB Chemistry HL 2.2.3 by identifying donor atoms, coordinate bonds and transition-metal complex structures from electron-pair evidence.

Exam points

identify the specific coordination bond in a displayed molecule, ion or complex
state which atom donates the lone pair that becomes the shared bonding pair
distinguish a coordination bond from ionic attraction or an intermolecular force

[Maximum number: 2]

Solid ionic compounds form crystal lattices.

Cobalt also forms chlorides with the formula $\mathrm{CoCl}_{2}$ .

Hydrated cobalt (II) ions, $\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}{ }^{2+}$ , are pink. Describe the interaction between the cobalt ion and a water molecule in terms of the type of bond and how this bond is formed.

Type of bond:
How the bond forms:
$\mathrm{CoCl}_{4}{ }^{2-}$ ions are blue.

Type of bond: coordinate/dative/covalent

How the bond forms: oxygen/water molecule /ligand donates $\mathrm{e}^{-}$ pair to cobalt«(II) ion»

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2.2.3—Coordination bonds question 1