Q80P - Chemistry: Molecular Nature Of Matter And Change

Question

(a) What is a coordinate covalent bond?

(b) Is it involved when FeCl₃ dissolves in water? Explain.

(c) Is it involved when HCl gas dissolves in water? Explain.

Step-by-Step Solution

Answer

a) A coordinate covalent bond is a bond formed between ligands and central metal ions.

b) Yes

c) No

Step 1: A coordinate covalent bond

A coordinate covalent bond is a bond formed between ligands and central metal ions.

Step 2: Covalent bond and its involvement

a) A coordinate covalent bond is a bond formed between ligands and central metal ion; ligands, which are Lewis bases, donate their electron pairs, and the central metal ion, which is Lewis acid, accepts them and that is how the covalent bond is formed.

b) When FeCl₃ dissolves in water, the coordination compound is formed:

${\text{FeCl}}_3+{\text{H}}_2\text{O}>>\left[\text{Fe}{\left({\text{H}}_2\text{O}\right)}_6\right]{\text{Cl}}_3;so,{\text{H}}_2\text{O}$ acts as a ligand in this coordination compound and Fe³⁺ is the central metal ion, so they form a coordinate covalent bond.

c) When HCl dissolves in ${\mathrm{H}}_2\mathrm{O}$, there is no coordination compound formed, so there is no coordination covalent bond involved.