An aqueous solution of iron(III) chloride (${\text{FeCl}}_3$) is found to be:

${\text{FeCl}}_3$ is a salt derived from a weak base (${\text{Fe(OH)}}_3$) and a strong acid ($\text{HCl}$). In an aqueous solution, it undergoes salt hydrolysis where ${\text{Fe}}^{3+}$ ions react with water molecules, generating an excess of hydronium (${\text{H}}_3{\text{O}}^{+}$) ions, which makes the resulting solution distinctly acidic.